To prepare a three meat cannelloni bake recipe, you will first need to prepare your ingredients. You will need: 1 pound of ground sirloin, 1 cup of diced onions, 2 tablespoons of thyme, 1/2 cup chopped parsley, and 1 tablespoon of Italian seasoning. Preheat the oven to 375 degrees F (190 degrees C) and grease an 8 x 8-inch baking dish with non-stick cooking spray. Set aside. In the bowl of an electric mixer, cream the butter with the sugar until light and fluffy. Add the eggs and beat until incorporated. Gradually add the milk, beating well after each addition. Pour the mixture into the prepared dish and stir to combine. Bake in the preheated oven for 35 to 40 minutes, or until the top is golden brown. Serve warm.