Captain Moonboot's Cheesy Mushroom & Spinach Breakfast Strata

🎩 A Word from Captain Moonboot

The Department of Breakfast Innovation at World Headquarters has discovered a remarkable way to turn yesterday's stale bread into tomorrow's delicious breakfast.

Apparently, all you need are some eggs, milk, cheese, vegetables and a baking dish.

Captain Moonboot immediately recognized the financial possibilities.

The Missus was particularly interested in the fact that everything could be assembled the night before and simply popped into the oven the following morning.

Today's creation is a hearty, golden-brown breakfast casserole loaded with sautéed mushrooms, tender spinach, sharp cheddar cheese and cubes of bread soaked in a savoury egg mixture.

It's somewhere between a quiche, a bread pudding and a very respectable excuse to eat cheese for breakfast.

Best of all, it makes enough to feed a crowd or provide several days of leftovers.

The Department of Household Economics has approved the expenditure.

Toad has requested that management investigate replacing the spinach with sausage.

Her Legal Beagle has advised her that vegetables are not, in themselves, grounds for litigation.

⏱️ Recipe Information

Servings: 6
Preparation Time: 20 minutes
Resting Time: 20 minutes minimum, or overnight
Baking Time: 40–50 minutes
Difficulty: Easy
Equipment: 9 × 13-inch baking dish, skillet, mixing bowl

🥘 Ingredients

For the breakfast strata

  • 6 cups day-old bread, cut into 1-inch cubes
  • 8 large eggs
  • 2 cups milk
  • 1 tablespoon Dijon mustard
  • 1 teaspoon Worcestershire sauce (optional)
  • 1 tablespoon butter
  • 1 tablespoon olive oil
  • 1 medium onion, finely diced
  • 8 oz (225 g) fresh mushrooms, sliced
  • 2 cups fresh baby spinach, roughly chopped
  • 2 cups shredded sharp cheddar cheese, divided
  • ½ teaspoon garlic powder
  • ½ teaspoon dried thyme
  • ¼ teaspoon smoked paprika
  • ½ teaspoon freshly ground black pepper
  • ¼ teaspoon salt

Optional additions

  • ½ cup diced cooked ham
  • ½ cup cooked and crumbled breakfast sausage
  • ¼ cup chopped green onions
  • ½ cup diced red bell pepper
  • ¼ cup grated Parmesan cheese
  • Pinch of cayenne pepper

👨‍🍳 Instructions

1. Prepare the baking dish

Lightly grease a 9 × 13-inch baking dish with butter or cooking spray.

Spread the bread cubes evenly across the bottom.

Day-old bread works best because it absorbs the egg mixture without becoming excessively soggy.

French bread, sourdough, Italian bread or ordinary sandwich bread will all work.

Moonboot Kitchen Observation: The Department of Bread Recycling has determined that stale bread is not necessarily a failed bakery product.

Sometimes it's simply an ingredient waiting for a promotion.

2. Sauté the vegetables

Heat the butter and olive oil in a large skillet over medium heat.

Add the diced onion and cook for approximately 3 minutes.

Add the sliced mushrooms and cook for another 5–7 minutes, stirring occasionally, until their moisture has mostly evaporated and they begin to brown.

Stir in the spinach and cook for approximately 1 minute, just until wilted.

Remove from the heat.

Season with the garlic powder, thyme and black pepper.

Allow the mixture to cool slightly.

3. Assemble the strata

Spread the mushroom and spinach mixture evenly over the bread cubes.

Sprinkle 1½ cups of the shredded cheddar cheese over the vegetables.

Gently toss everything together so the vegetables and cheese are distributed throughout the bread.

4. Prepare the egg mixture

In a large mixing bowl, whisk together:

  • Eggs
  • Milk
  • Dijon mustard
  • Worcestershire sauce, if using
  • Smoked paprika
  • Salt

Whisk until thoroughly combined.

Pour the egg mixture evenly over the bread and vegetables.

Using a spatula, gently press the bread cubes down so they absorb the liquid.

Sprinkle the remaining ½ cup of cheddar cheese over the top.

5. Allow the bread to soak

Cover the baking dish.

For immediate preparation, allow the mixture to rest in the refrigerator for at least 20 minutes.

For an easy morning breakfast, refrigerate overnight.

The bread will absorb the seasoned egg mixture, creating a tender interior when baked.

Captain Moonboot's Important Discovery: Apparently, preparing breakfast the night before means you can accomplish something productive while you're sleeping.

The Department of Labour Relations is investigating whether this qualifies as overtime.

6. Bake

Preheat the oven to 350°F (175°C).

Remove the strata from the refrigerator while the oven preheats. If using a glass or ceramic dish, follow the manufacturer's instructions for avoiding thermal shock.

Remove the cover.

Bake for 40–50 minutes, until the top is golden brown, the centre is set and a food thermometer inserted into the middle registers at least 165°F (74°C).

A deeply chilled overnight strata may require an additional 5–10 minutes.

If the top begins browning too quickly, loosely cover it with aluminum foil.

7. Rest and serve

Remove the strata from the oven.

Allow it to rest for approximately 10 minutes before slicing.

Cut into six generous portions.

Serve warm with fresh fruit, sliced tomatoes or a little hot sauce.

For a particularly hearty breakfast, add a few slices of crispy bacon on the side.

The Department of Breakfast Appreciation strongly supports this suggestion.


🌟 Captain Moonboot's Kitchen Notes

Make it economical: This recipe is an excellent way to use leftover bread, vegetables and small amounts of cheese.

Use frozen spinach: Substitute approximately ½ cup of thawed, thoroughly squeezed frozen spinach for the fresh spinach.

Add meat: Cooked ham, bacon or breakfast sausage makes an excellent addition. Any added meat should be fully cooked before assembly.

Change the cheese: Swiss, Monterey Jack, mozzarella or a combination of cheeses will work beautifully.

Make it vegetarian: Omit the Worcestershire sauce or use a vegetarian version, and skip the meat additions.

Make it spicy: Add diced jalapeños, hot sauce or a pinch of cayenne pepper.

Try different vegetables: Broccoli, asparagus, bell peppers or caramelized onions are excellent alternatives. Cook vegetables that release substantial moisture before adding them.

Make individual portions: Divide the mixture among greased muffin cups and bake at 350°F (175°C) until fully set and the centres reach 165°F (74°C), generally 20–30 minutes.

Storage: Refrigerate leftovers promptly in an airtight container for up to 3–4 days.

Freezing: Wrap individual cooked portions tightly and freeze for up to 2 months for best quality.

Reheating: Warm refrigerated portions in the microwave or a covered baking dish until thoroughly heated to 165°F (74°C).


🍽️ Captain Moonboot's Serving Suggestion

For a relaxed Sunday morning at World HQ, serve generous squares of breakfast strata alongside fresh orange slices, sliced tomatoes and a steaming cup of coffee.

A spoonful of salsa makes a surprisingly delicious topping.

Captain Moonboot considers this particularly appropriate because the cookbook is called Making Salsa, and management occasionally feels obligated to justify the title.

For supper, serve the strata with a simple green salad.

The Department of Meal Classification has confirmed that eggs may legally be consumed after noon.

The Missus has suggested that this was never in question.


🚨 WORLD HQ EDITORIAL NOTICE

The Department of Breakfast Innovation has officially approved Recipe #41 for inclusion in Making Salsa: Recipes & Other Bad Decisions from Captain Moonboot.

Following extensive research, the Department has determined that leftover bread can be successfully transformed into a substantial breakfast casserole through the application of eggs, cheese and vegetables.

Captain Moonboot has described the discovery as an important advancement in household food economics.

The Missus has pointed out that breakfast casseroles have existed for generations.

The Captain has requested that she stop interfering with the Department's patent application.

Meanwhile, Toad has filed a formal complaint alleging that the recipe discriminates against employees who prefer meat.

Her Legal Beagle has reviewed the evidence and advised that the inclusion of optional sausage constitutes a reasonable accommodation.

Toad has rejected the proposed settlement.

She is now demanding that the sausage be mandatory and the spinach optional.

The Department of Human Resources has referred the matter to arbitration.

Lucy has volunteered to serve as the independent arbitrator.

Toad's lawyer has objected on the grounds of an obvious conflict of interest.

Lucy has responded by knocking his legal brief off the desk.

The Captain has ordered both parties to cease hostilities until after breakfast.

The Missus has reminded everyone that the breakfast is getting cold.

Management has temporarily suspended all legal proceedings.

Recipe #41 is officially ready for the World HQ cookbook! 🍳🧀🍄