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Meanwhile, in a 4-quart pot, melt 2 sticks of the butter over low heat and then add the flour, mustard powder, seasoned salt, salt and pepper. Cook 2 minutes, stirring with a whisk. Add the milk a little at a time, whisking, and cook until thickened and smooth, 6 to 8 minutes. Remove the pot from the heat and stir in the American and gouda cheeses along with 4 cups of the Cheddar until melted and thoroughly combined. Add the cooked macaroni and stir well.
Pour the macaroni mixture into a 3-quart baking dish and dot with the remaining 1/2 stick butter. Sprinkle the remaining 1 cup Cheddar on top, then sprinkle with the smoked paprika. Bake until the cheese is browned on top, 25 to 30 minutes. Serve hot.