Melt 3 Tbsp butter over medium heat in a large, oven-safe skillet. Meanwhile, in a small bowl, combine the bread crumbs, parsley, basil, 1/2 tsp salt, and 1/4 tsp pepper. Then, add the melted butter and stir until combined. Set aside.
Melt 2 Tbsp of butter over medium heat in the same skillet. Add the garlic, onions, and carrots and sauté until the onions are translucent, about 6–8 minutes. Add the broccoli and sauté for another 2 minutes. Add the zucchini, corn, and peppers and sauté for another 2 minutes. Add flour and sauté for another minute. Add the milk and heat until nearly simmering and the mixture has thickened, stirring constantly.
Reduce the heat to low and add both cheeses, 1 tsp salt, and 1/4 tsp pepper. Stir until the cheese has melted and then remove the pan from the heat. Add the pasta and stir until it's evenly coated with sauce and vegetables. Top the surface of the mac and cheese with the tomato slices. Finish the dish by sprinkling the bread crumb mixture over the tomatoes.
Bake for 45 minutes, or until the tomatoes are cooked through and the crumbs are golden.
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