4 tablespoons butter, plus more for greasing pan

4 cloves garlic, minced

1/4 cup flour

2 cups milk

1 teaspoon dijon mustard

1/2 teaspoon sea salt and a few cracks fresh black pepper

2 + 1/2 cups cheddar cheese, shredded

1/3 cup fresh Parmesan cheese, shredded

3 cups cooked rice ( I used brown)

2 -3 cups cooked broccoli florets