Preheat the oven to 350 degrees F. Butter a deep-dish 9x13 baking dish and pour in the pasta mixture. (You can also use a regular 9x13 baking dish and make a few extra individual servings in ramekins or only make individual servings.)
Melt the butter over medium-high heat in a large stock pot (large because we're stirring in the noodles later) and cook the onions until soft and translucent, 5-7 minutes. Add the garlic and cook for another minute. Stir in the flour and cook for 2 minutes, stirring regularly.Pour in the milk and heavy cream, stirring continually until the flour is dissolved. Simmer until the the mixture is thickened. Add the cheddar cheese and gorgonzola and simmer, stirring frequently, until melted. Add all remaining ingredients except for the noodles and stir to combine. Let the mixture simmer for 3-4 minutes. Add salt and pepper to taste. Stir in the noodles.
Prepare the breadcrumb topping by combing all ingredients in a medium mixing bowl and stirring until fully incorporated. Sprinkle the breadcrumb topping evenly over the mac and cheese.
Bake on the middle shelf of the oven for 30-35 minutes or until it's bubbly and the breadcrumbs are golden brown. Remove from oven and let sit for 5 minutes before serving.
Keyword Pumpkin Mac and Cheese
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