Nourish PA: Lentil Sloppy Joes

Ingredients

• 1 tablespoon olive oil
• 1 small yellow onion, chopped
• 1 large bell pepper, seeded and chopped
• 1 1/2 cups ketchup
• 2 cups cooked lentils
• 2 tablespoons brown sugar
• 1 tablespoon yellow mustard, or mustard powder
• Salt and pepper, to taste
• 6 hamburger buns, split and toasted
• Shredded cheddar cheese, for serving (optional)