Step 1

Preheat the oven to 350 degrees F.

Step 2

Grease a 9x13-inch baking dish.

Step 3

Heat a large skillet over medium-high heat.

Step 4

Add the bacon and the onion to the skillet and cook, stirring regularly, until the bacon is evenly browned, about 10 minutes.

Step 5

Drain the excess liquid from the skillet.

Step 6

In a large bowl, add the bacon mixture, the eggs, the hash brown potatoes, the cheddar cheese, the cottage cheese, and the Swiss cheese and stir to combine.

Step 7

Pour the bacon mixture into the prepared baking dish.

Step 8

Bake the casserole until the eggs are set and the cheese is melted, about 45-50 minutes.

Step 9

Allow the casserole to stand for 10 minutes before cutting and serving.

Step 10

Serve.