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Boil the pasta according to package directions, drain and set aside.
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In a large sauce pan, heat the olive oil and butter over medium heat. Saute the garlic for 1-2 minutes, then add the pumpkin and chicken stock.
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Add the onion powder, chili powder, cayenne pepper, salt and pepper. Whisk until smooth and let cook for a few minutes.
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Add the Greek yogurt and parmesan cheese and whisk until smooth.
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Toss the cooked pasta with the sauce and serve with an additional sprinkle of parmesan.