Broccoli Casserole

This is another dish that I made for Thanksgiving. Really the only work you have to do is saute the onions. Everything else just gets mixed together. I made this in the morning ahead of time and then just re-heated it through in the over before dinner. It was really yummy. Makes 8 servings.

3 tablespoons butter
1 onion, chopped
2 (10 ounce) packages chopped frozen broccoli, thawed
1 (10.75 ounce) can condensed cream of mushroom soup
1 cup shredded sharp Cheddar cheese
1 cup mayonnaise
2 eggs, beaten
1/2 teaspoon garlic salt
1/4 teaspoon ground black pepper
1/2 teaspoon seasoned salt
1 1/2 teaspoons lemon juice
12 buttery round crackers, crushed fine
2 tablespoons butter

Preheat oven to 350 degrees F (175 degrees C).
Melt 3 tablespoons butter in a medium skillet over medium-high heat. Saute onion until golden.
In a 2 quart casserole dish, mix together onion, broccoli, soup, cheese, mayonnaise, eggs, garlic salt, pepper, seasoned salt, and lemon juice. Sprinkle crushed crackers over top and dot with remaining 2 tablespoons butter.
Bake uncovered in preheated oven for 45 minutes, until heated through and browned on top.