Melt 2Tbsp butter in large saucepan over medium heat. Add onion
and cook, stirring occasionally until softened, about 5 minutes. Add
flour and cook, stirring constantly, about 1 minute. Gradually whisk
in milk. Increase heat and cook, whisking constantly, until slightly
thickened, 3-4 minutes. Whisk in cheddar cheese, Parmesan cheese,
salt and pepper. Cook whisking occasionally, until cheese melts,
about 1 minute.
|
Remove from heat. Stir in macaroni and tomatoes with their juice.
Pour into baking dish. Melt remaining 1 Tbsp butter in small skillet;
add bread crumbs and cook until they are evenly coated, about 1
min. Sprinkle over macaroni and bake until bubbly and the top is
golden, about 25 minutes.
|