Cover pumpkin seeds with boiling water and set aside for 20 minutes
While the pumpkin seeds are soaking, add the potatoes and carrots to a 2-quart pot and cover with water. Bring to a boil and cook until very soft (approximately 10-15 minutes).
Add ½ cup water, nutritional yeast, lemon juice, salt, garlic powder, onion powder, smoked paprika and red pepper hot sauce to a high-powered blender.
Drain pumpkin seeds along with the potatoes and carrots in a mesh strainer (5 ½" or 7 ⅞" size) and add to the blender.
Secure the lid and blend on high, scraping down the sides as needed, until the ingredients are well-incorporated and the sauce is smooth and creamy (approximately 2 minutes). If the sauce is too thick for your liking after you've used ½ cup water, you can add 1-2 tablespoons more water and blend again.