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A scrumptious mac and cheese topped with tomatoes and crunchy panko crumbs. Yummy!
Preheat oven to 350 degrees.
Cook pasta until al dente.
Melt butter in a large skillet. Sprinkle in flour, whisk to combine, and cook for 2 to 3 minutes until it deepens in color. Pour in milk, whisking constantly. Add mustard, salt, and pepper. Continue cooking until it thickens, 4 minutes or so. Add cheese and stir until melted. Pour in cooked pasta and stir to coat. Check seasonings and add more salt if needed.
Pour into a buttered casserole dish. Top with 3/4 of the panko crumbs. Arrange tomato slices neatly on the top. Sprinkle with salt and pepper. Top with the rest of the panko crumbs.
Bake for 20 minutes. Broil for 3 to 4 minutes at the end to make the top golden brown.