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Melt vegan butter. Add garlic, onions and fresh sage and stir well. Sauté over medium heat until onions are translucent (about 3 minutes).
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Add nutritional yeast, cumin, red pepper flakes, pumpkin pie spice, smoked paprika and lemon juice to the skillet.
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Stir until all ingredients are well incorporated.
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Add plant milk, a little at a time, stirring continuously until vegan cheese sauce has a smooth, creamy texture.
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Toss in pumpkin purée. Stir until well-incorporated.
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Simmer sauce over medium heat for 2-3 minutes. Sprinkle in corn starch a little at a time while continuing to stir until dissolved. Bring to gentle boil for one minute (keep stirring). Remove from heat. Season creamy pumpkin sauce with sea salt and black pepper to taste.
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Add cooked pasta to baking dish. Pour in pumpkin cheese sauce. Stir well.
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Top with bread crumbs and crisp sage fried in a bit of olive oil. If you desire, sprinkle with vegan parmesan cheese, as well. Grab your pasta dish and place in a preheated oven. Bake at 375F/blahC for 30 minutes. Remove from oven and place on cooling rack for 5 minutes. Serve immediately.