Easy Make-Ahead Breakfast Casserole for Busy Mornings - My Home Made Recipe

Ingredients

• 1 tablespoon olive oil
• 1 lb (450 g) breakfast sausage
• 1 small yellow onion, diced
• 1 red bell pepper, diced
• 8 cups (about 300 g) day-old bread cubes, from sourdough, French bread, or challah
• 10 large eggs
• 2 1/2 cups (600 ml) whole milk
• 1 tablespoon Dijon mustard
• 1 teaspoon garlic powder
• 3/4 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 2 cups (225 g) shredded sharp cheddar cheese, divided
• 2 tablespoons chopped fresh parsley or green onion, optional