broccoli casserole recipe

### Ingredients: - **4 cups** broccoli florets, steamed - **1 can** (10.5 ounces) condensed cream of mushroom soup - **1 cup** shredded cheddar cheese - **1/2 cup** mayonnaise - **1/4 cup** sour cream - **1 egg**, beaten - **1/4 cup** finely chopped onion - **1/4 teaspoon** garlic powder - **1/4 teaspoon** salt - **1/4 teaspoon** black pepper - **1/2 cup** crushed crackers (like Ritz or breadcrumbs) - **2 tablespoons** melted butter