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Bring a large pot of salted water to boil. Add 1 lb pasta and cook until just al dente.
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Before draining, reserve 1 cup of pasta water. This starch will help the sauce cling to pasta.
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Add cottage cheese to a blender with Greek yogurt. Blend until smooth and creamy.
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Heat 2 tbsp butter in a large skillet. Add minced garlic and cook for 1 minute until fragrant.
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Add the blended cottage cheese mixture. Stir gently and let heat through (about 2-3 minutes).
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Add reserved pasta water, 1/4 cup at a time, while stirring to create a silky sauce.
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Add the drained pasta to the sauce and toss gently off heat. Add butter and Parmesan cheese.
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Fold in fresh dill and parsley to preserve color and freshness. Add lemon juice to taste.
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Season with salt, white pepper, and red pepper flakes to taste.
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Serve immediately while warm. Leftovers keep 3-4 days in an airtight container.