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Preheat oven to 375°F and grease a 9” skillet (or 9x13” pan) with some butter or cooking oil spray.
Add 2 tablespoons of salt to a large pot of water and bring to a boil. Cook macaroni until al dente (according to package directions) and drain.
Melt the butter in a large saucepan over medium heat. Add onion and cook until translucent (about 5 minutes).
Stir in the flour, mustard powder, pepper, and salt. Let the flour cook for 1 minute, stirring often.
Slowly pour in milk, stirring or whisking continuously, and cook until thickened (a few minutes). Add in the 8oz gouda and 2 oz cheddar and stir until melted.
Remove from heat. Stir in the drained pasta. Transfer the macaroni to the prepared baking dish. Top with remaining cheese in an even layer. Bake for 20 minutes, until the cheese is melted and lightly browned.