Step 1

Preheat the oven to 325 degrees F.

Step 2

Grease a 9x13-inch baking dish with cooking spray.

Step 3

Beat the eggs, the milk, the sour cream, and the salt together in a large bowl until well-blended.

Step 4

Mix the ham, the bell peppers, the mushrooms, and the green onions into the egg mixture.

Step 5

Pour the egg mixture into the prepared baking dish.

Step 6

Bake until a knife inserted into the center comes out clean, about 50 minutes.

Step 7

Top the dish with the cheddar cheese and bake until the cheese is melted, about 3 minutes.

Step 8

Serve.