Preheat the oven to 375 degrees F (190 degrees C). Lightly grease a 9x13-inch baking dish.
In a skillet, saute the onions & peppers for about 3 minutes. Add the garlic and saute for about 1 minute, then add the spinach for another minute until it's wilted.
Place chicken, chicken soup, sour cream, cheese, veggie mixture, green onions, almonds, bacon, and hot sauce into a large mixing bowl and stir to combine. Pour mixture into the prepared dish.
Stir crushed crackers and butter together until combined; spread mixture evenly over casserole.
Bake in the preheated oven until browned and bubbly, 40 to 45 minutes.
