Heat oil in a large skillet over medium-high heat. Add the onion, garlic, and sweet potatoes and cook for 5-7 minutes, until softened.
Add the seasonings (if using garlic powder, add it here) and cook for 1-2 minutes
Add the rest of the ingredients and bring to a boil. Cover, reduce heat, and simmer for 30-35 minutes, until lentils are cooked through
Add cheese (See note) and cover with a lid until the cheese has melted.
