Heat the oil in a large pot over medium-high heat. Add diced onions, and sauté for 3 minutes until soften
Add the bell peppers, 2-3 minutes.
Add garlic, chili powder, cumin, smoked paprika, and cayenne. Cook about 30 seconds and continue stirring, until fragrant.
Stir in the diced tomatoes with their juices, tomato paste, maple syrup, and vegetable broth. Bring to a gentle boil.
Reduce heat and simmer 8 -10 minutes. Stirring occasionally.
Stir in the drained and rinsed lentils. Simmer for another 5 - 8 minutes, or until heated through and the chili has thickened to your liking.
Season with salt to taste.
Serve hot with your favorite toppings.