Preheat the oven to 350°F.
Spray a 13x9-inch baking dish with cooking spray.
In a large bowl, combine the thawed corn, cream-style corn, sour cream and melted butter until well combined.
Stir in cheese, onions and peppers until combined.
In a small bowl, beat the eggs and stir them into the corn mixture.
Season with salt, pepper and garlic powder and stir to combine.
Pour the mixture into the prepared baking dish and spread evenly.
Sprinkle with crushed crackers.
Bake for 45-55 minutes or until the casserole is set and the crackers are golden brown.
Remove the casserole from the oven and allow it to cool for 5 minutes before serving.