Set the oven to 425 F. Poke holes in the potatoes and set them on a baking sheet. Cook for 40 minutes or until tender. Depending on the size of the potatoes, you can also microwave them for 5 - 10 minutes.
Cook lentils with garlic and onion. Stir in dijon mustard for flavor.
Add lentil mixture to top sweet potatoes.
Notes
Leftovers: Store the second potato in the refrigerator to eat the next day
More Protein: Add shredded chicken to the sweet potato (½ cup cooked lentils = 12 g of protein)
Greens: Add spinach or kale to the lentil mixture.