Preheat oven to 425 degrees.
Add sweet potatoes to a sheet pan, preferably lined with parchment paper or silicone. Toss with olive oil, salt, black pepper, onion powder, garlic powder, thyme and paprika. Add the sage, shallot and garlic to the same sheet pan.
Remove the sage from the oven after 10 minutes. Bake for 10-15 more minutes, check on the garlic and shallot. If they are browned, remove them from the oven. Bake the sweet potatoes for 5-10 more minutes until soft and browned.
Add garlic, shallot, sage, sweet potato, broth, red pepper flakes, black pepper and ricotta to a blender. Blend until smooth. Taste and add salt if desired.
Add pasta and sauce to a skillet over low heat. Toss together until combined and warm. Serve and enjoy.