One-Pot Breakfast Casserole Muffins

Featured in: Sunbeam Starts

These one-pot breakfast casserole muffins combine eggs, shredded cheese, and fresh vegetables like spinach and bell pepper in a convenient, portable form. Optional protein such as cooked bacon or sausage adds extra flavor and heartiness. The mixture is whisked together, divided into a greased muffin tin, and baked until set and golden. Ideal for meal prepping, they can be enjoyed hot or cold and stored refrigerated or frozen. Seasoned simply with salt, pepper, and smoked paprika, these muffins offer a flavorful start to your day with minimal prep and easy cleanup.

Updated on Wed, 19 Nov 2025 10:46:00 GMT
Golden brown One-Pot Breakfast Casserole Muffins filled with savory cheese, vegetables, and bacon, perfect for meal prep. Save
Golden brown One-Pot Breakfast Casserole Muffins filled with savory cheese, vegetables, and bacon, perfect for meal prep. | cheerfulchefs.com

Savory, portable breakfast muffins packed with eggs, cheese, and veggies—perfect for meal prep, budget-friendly, and delicious hot or cold.

I first started making these breakfast casserole muffins when my family needed something quick and nourishing for early school days. Everyone enjoys picking their favorite mix-ins, and I love that lunchboxes stay mess-free.

Ingredients

  • Base: 8 large eggs, 1/3 cup whole milk (or dairy-free alternative)
  • Vegetables: 1 cup baby spinach, chopped, 1/2 cup red bell pepper, diced, 1/2 cup onion, finely chopped
  • Protein (optional): 3/4 cup cooked bacon or breakfast sausage, crumbled (omit for vegetarian)
  • Cheese: 1 cup shredded cheddar cheese (or Monterey Jack)
  • Seasonings: 1/2 teaspoon salt, 1/4 teaspoon black pepper, 1/4 teaspoon smoked paprika
  • Oils: 1 tablespoon olive oil or nonstick spray (for greasing muffin tin)

Instructions

Prep Muffin Tin:
Preheat oven to 350°F (175°C). Grease a 12-cup muffin tin with olive oil or nonstick spray.
Whisk Eggs & Milk:
In a large bowl, whisk together eggs and milk until fully combined.
Add Fillings:
Stir in spinach, bell pepper, onion, cooked bacon or sausage (if using), cheese, salt, black pepper, and smoked paprika.
Divide & Fill:
Divide the mixture evenly among the 12 muffin cups, filling each about 3/4 full.
Bake:
Bake for 22–25 minutes, or until muffins are set and lightly golden.
Cool & Serve:
Cool in the tin for 5 minutes, then run a knife around the edges and remove muffins. Serve warm or allow to cool completely for storage.
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| cheerfulchefs.com

Weekends often mean everyone gathers in the kitchen to fill and bake their own breakfast muffin, creating a new flavor for each person. It's a fun and tasty way to start the day together.

Required Tools

12-cup muffin tin, mixing bowl, whisk, knife and cutting board, oven

Allergen Information

Contains: Eggs, milk, cheese. May contain: pork (if using bacon/sausage). For dairy-free: use plant-based milk and cheese. Always check ingredient labels.

Nutritional Information

Calories: 130, Total fat: 9 g, Carbohydrates: 2 g, Protein: 9 g per muffin (with bacon and cheddar)

Cheesy One-Pot Breakfast Casserole Muffins steaming fresh from the oven, ideal for a quick and easy breakfast or brunch. Save
Cheesy One-Pot Breakfast Casserole Muffins steaming fresh from the oven, ideal for a quick and easy breakfast or brunch. | cheerfulchefs.com

Breakfast casserole muffins are a simple, reliable go-to for any morning. Try a batch this weekend and enjoy stress-free mornings ahead.

Recipe FAQs

Can I make these muffins vegetarian?

Yes, simply omit the bacon or sausage and add extra veggies like mushrooms or zucchini to keep them flavorful.

What dairy-free alternatives can I use?

Use plant-based milk options such as almond or oat milk and substitute cheddar with vegan cheese varieties to make a dairy-free version.

How should I store the muffins?

Refrigerate muffins for up to 4 days or freeze for up to 2 months. Reheat in the microwave or oven before serving.

Can I add fresh herbs?

Absolutely. Adding fresh herbs like chives or parsley enhances the flavor and adds freshness.

What is the best way to ensure muffins don’t stick?

Grease the muffin tin well using olive oil or a nonstick spray before adding the batter to prevent sticking.

One-Pot Breakfast Casserole Muffins

Portable muffins packed with eggs, cheese, and veggies. Ideal for quick breakfast or meal prep.

Prep Time
15 minutes
Cook Time
25 minutes
Overall Time
40 minutes
Creator Ruby Smiles

Recipe Type Sunbeam Starts

Skill Level Easy

Cuisine Background American

Portions 12 Serves

Dietary Preferences Vegetarian-Friendly, Gluten-Free Option, Low-Carb Option

What You’ll Need

Base

01 8 large eggs
02 80 ml whole milk or dairy-free alternative

Vegetables

01 30 g baby spinach, chopped
02 75 g red bell pepper, diced
03 75 g onion, finely chopped

Protein (optional)

01 85 g cooked bacon or breakfast sausage, crumbled

Cheese

01 115 g shredded cheddar cheese or Monterey Jack

Seasonings

01 1/2 teaspoon salt
02 1/4 teaspoon black pepper
03 1/4 teaspoon smoked paprika

Oils

01 1 tablespoon olive oil or nonstick spray (for greasing muffin tin)

Step-by-Step Guide

Step 01

Preheat and prepare muffin tin: Preheat oven to 175°C (350°F). Lightly grease a 12-cup muffin tin with olive oil or nonstick spray.

Step 02

Combine eggs and milk: In a large mixing bowl, whisk together eggs and milk until fully blended.

Step 03

Incorporate ingredients: Fold in chopped spinach, diced bell pepper, finely chopped onion, crumbled cooked bacon or sausage if using, shredded cheese, salt, black pepper, and smoked paprika until evenly combined.

Step 04

Fill muffin cups: Divide the mixture evenly among the 12 muffin cups, filling each approximately three-quarters full.

Step 05

Bake muffins: Bake in preheated oven for 22 to 25 minutes, or until the muffins are fully set and lightly golden on top.

Step 06

Cool and serve: Allow muffins to cool in the tin for 5 minutes, then carefully run a knife around the edges to remove. Serve warm or cool completely before storing.

Tools You’ll Need

  • 12-cup muffin tin
  • Mixing bowl
  • Whisk
  • Knife and cutting board
  • Oven

Potential Allergens

Inspect ingredients for specific allergens and contact a professional for concerns.
  • Contains eggs, milk (dairy), and cheese (dairy). May contain pork if bacon or sausage is used. For dairy-free preparation, substitute with plant-based milk and cheese.

Nutritional Details (Per Serving)

Provided as supportive info; always cross-check with your healthcare provider.
  • Calories: 130
  • Fats: 9 grams
  • Carbohydrates: 2 grams
  • Proteins: 9 grams