Broccoli Cheddar Squares - Yay! For Food

Ingredients

• 2 tbsp (1 oz.) unsalted butter, melted
• 3 large eggs
• 1 cup milk
• 1 cup all-purpose flour
• 1 tsp baking powder
• ½ tsp sea salt
• ½ tsp black pepper
• 1 lb. fresh broccoli florets
• ½ large onion (white or yellow), diced
• 2 cups cheddar cheese, freshly grated