Place the lentils, kidney beans, onion, garlic, bell pepper, crushed tomatoes, vegetable broth, chili powder, cumin, smoked paprika, salt, and pepper into the slow cooker.
Stir everything until the spices are evenly distributed.
Cover and cook on low for 7 hours until the lentils are soft and the chili has thickened.
About 30 minutes before the chili finishes, heat the oven to 400°F and grease an 8x8 baking dish.
In a mixing bowl, whisk together the cornmeal, flour, baking powder, and sugar.
Add the milk, egg, and oil to the dry mixture and stir just until combined.
Pour the batter into the prepared dish and bake for 20 minutes until the top is golden and a toothpick comes out clean.
Let the cornbread cool for 5 minutes, then cut into squares and serve with the chili.