Preheat your oven to 400°F (200°C). Scrub the sweet potato clean, wrap it in foil, place it on a baking sheet, and bake for 45–60 minutes, or until a fork slides in easily with no resistance. Short on time? Pierce the sweet potato all over and microwave on high for 7–9 minutes, flipping halfway through — it works perfectly for this recipe.
Cook the high-protein spaghetti according to package directions. Reserve 1 cup of pasta water before draining.
In a blender, combine cottage cheese, baked sweet potato, pasta water, salt, pepper, and garlic powder. Blend until smooth and creamy. Return pasta to the pot or skillet over low heat.
Pour in the sauce and toss until fully coated. Add extra pasta water if needed.
Taste and adjust seasoning. Serve warm.