Baked Cauliflower Casserole with Cheesy Bacon Crust

2 tbsp butter, unsalted + 1 tbsp butter for greasing dish
4 cloves garlic, minced
2 eggs, beaten
2 cups cauliflower, chopped
1/2 yellow onion
1 cup Parmesan cheese
5 slices bacon, crisp and crumbled

Preheat oven to 350F. Grease casserole dish with butter. In a skillet, heat butter and sauté onions and garlic until onions are tender and slightly golden. Add cauliflower and cook for another minute. Scoop into casserole. Combine eggs, Parmesan cheese and crumbled bacon in separate bowl. Pour over cauliflower, then bake for 1 hour.