Three-Cheese Mac and Cheese

Prepare pasta according to package directions.  Drain and set aside.

Meanwhile, melt butter in a saucepan over medium heat. Add onions and garlic; cook about 1 minute. Add flour and cook an additional 1 minute, stirring constantly. Gradually add milk and mustard powder and season with salt and pepper, whisking until blended. Bring to a boil and cook until thick, about 2 minutes. Stir in cheeses until melted.

Remove from heat and add cooked pasta. Pour into 4 small greased baking dishes. Bake 15 minutes or until golden and bubbly.