Preheat oven to 400°F.
Coat a 9" x 13" casserole dish with cooking spray and set aside.
Combine all ingredients (except crushed crackers) in a large bowl and mix well.
Spread mixture into prepared baking dish and sprinkle with the crushed crackers.
Bake in preheated oven for 40-45 minutes until heated through and bubbly.