1-Step 1: Prepare Your Baking Dish and Oven Start by preheating your oven to 350 degrees Fahrenheit. This temperature is ideal for cooking the eggs evenly without overbrowning the top. While the oven heats up, spray a 9×13-inch baking pan generously with cooking spray. This prevents sticking and makes serving much easier. A glass or ceramic dish works best for even heat distribution, but metal pans work too.

2-Step 2: Mix the Egg Base In a large bowl, crack all 12 eggs. Add the sour cream, milk, salt, and pepper. You can mix this by hand with a whisk or use an electric mixer on low speed either method works perfectly. The goal is to combine everything until smooth and slightly frothy, which usually takes about 1-2 minutes of mixing. Don’t worry if you see small bits of sour cream; they will blend during baking. Eggs offer numerous health benefits, making this dish as nutritious as it is delicious.

3-Step 3: Cook the Sausage Place a large skillet over medium heat and add the sausage. Break it into small pieces with a wooden spoon or spatula as it cooks. Continue cooking until the sausage is browned throughout, which typically takes about 8-10 minutes. Once fully cooked, drain most of the grease, leaving just a small amount for flavor. Transfer the cooked sausage to your egg mixture bowl.

4-Step 4: Sauté the Vegetables Using the same skillet (no need to wash it), add the diced bell peppers and green onions. Sauté them for 2-3 minutes over medium heat. You want them softened but still with a bit of crunch they’ll continue cooking in the oven. The residual flavors from the sausage will infuse into the vegetables, adding extra depth to your casserole. Once sautéed, add these vegetables to the bowl with the eggs and sausage.

5-Step 5: Combine Everything Together Now add the shredded cheddar cheese to your bowl. Gently stir everything together until all ingredients are evenly distributed. Take care not to overmix you want everything combined, but you don’t want to deflate the eggs. The mixture should look colorful and chunky, with visible pieces of sausage, peppers, and cheese throughout.

6-Step 6: Bake the Casserole Pour the entire mixture into your prepared 9×13-inch pan, spreading it evenly with a spatula. Place the pan in your preheated oven and bake for 35-50 minutes. The baking time can vary based on your oven and the exact depth of your pan. You’ll know it’s done when the edges are set, the top is golden brown, and the center is just slightly jiggly. Don’t worry about that slight jiggle the casserole continues to set as it cools.

7-Step 7: Cool and Serve Remove the casserole from the oven and let it rest for about 5-10 minutes before slicing. This resting period allows the casserole to set completely, making it easier to cut clean squares. Serve warm, and enjoy the fluffy texture and savory flavors of your homemade breakfast creation.