1 lb bacon, cut into 1-inch pieces

1 medium onion, chopped (1/2 cup)

1 medium red bell pepper, chopped (3/4 cup)

1 package (8 oz) sliced fresh mushrooms

2 tablespoons Dijon mustard

1/2 teaspoon salt

1/2 teaspoon pepper

3/4 cup milk

12 eggs

1 package (2 lb) frozen hash browns, thawed

2 cups shredded Cheddar cheese (16 oz)