Crabby Morning Bake

Ingredients

• 2 tablespoons Dijon mustard
• 6 English muffins, split
• 1 (8-ounce) carton lump crabmeat, drained
• 2 teaspoons lemon zest, plus 2 tablespoons lemon juice
• 2 cups white cheddar cheese, shredded
• 12 large eggs
• 1 cup half-and-half
• 1 cup 2% milk
• 1/2 cup mayonnaise
• 1 teaspoon salt
• 1/2 teaspoon cayenne pepper
• 1/2 teaspoon black pepper
• 2 cups Swiss cheese, shredded
• 1 cup parmesan cheese, grated
• 4 green onions, chopped, plus more, to taste, for garnish
• 1/4 cup red bell pepper, finely chopped
• 1/4 cup yellow bell pepper, finely chopped