01 -  Set the oven to 350°F (175°C) and prepare a 9x13-inch baking dish or a large ovenproof skillet by greasing it with butter or nonstick spray. 
 02 -  Distribute the quartered biscuit dough evenly across the bottom of the prepared dish. 
 03 -  In a mixing bowl, whisk together eggs, milk, salt, black pepper, and smoked paprika until fully blended. 
 04 -  Fold in cheddar cheese, mozzarella cheese, Parmesan cheese, diced bell pepper, onion, chopped spinach, and any optional meat. 
 05 -  Pour the egg and vegetable mixture evenly over the biscuit pieces, then gently press down with a spatula to mostly submerge the biscuits. 
 06 -  Drizzle melted butter evenly over the surface. 
 07 -  Transfer to the oven and bake for 25 to 30 minutes until puffed and the center is just set. 
 08 -  Remove from the oven and allow to rest for 5 minutes before slicing. Garnish with chopped parsley if desired.