Preheat the oven to 350 degrees F. and spray a casserole dish with cooking spray.
In a large bowl, combine all the ingredients and stir until well mixed.
Pour into the greased casserole dish and bake, uncovered, for 40-45 minutes, until the edges are golden brown and the center is set.
Cool in the pan for 5-10 minutes and slice into 6 squares.
