In a skillet, heat the olive oil over medium heat. Add the chopped onion and bell pepper, and cook until softened, about 5 minutes.
Add the cooked lentils, diced tomatoes, garlic powder, onion powder, smoked paprika, salt, and black pepper to the skillet. Stir to combine and cook for another 5 minutes.
Transfer the mixture to a baking dish and top with shredded vegan cheese.
Bake in the preheated oven for 20 minutes, or until the cheese is melted and bubbly.
Let the casserole cool for a few minutes before serving. Enjoy!
Notes:
This vegan cheeseburger casserole is perfect for a family dinner or meal prep. Feel free to add your favorite burger toppings like pickles or mustard before serving.