Cook the lentils according to package instructions.
Add the spices to a spice blender, coffee grinder, or mortar and pestle and blend together until the fennel seeds are broken down.
Add the cooked lentils, walnuts, ½ of the diced yellow onion, garlic, parsley, and spices to a food processor. Blend together briefly and pulse until the ingredients come together into a fine crumb.
Preheat the over to 400°F
In a skillet, heat a drizzle of oil over medium heat. Add the lentil-walnut crumble and cook, stirring occasionally, for about 5 - 7 minutes or until the onions are soft and the mixture is starting to brown.
Set the mixture aside, clean the skillet if needed, and then add the mushrooms and the rest of the diced onions to the skillet. Cook for about 5-7 minutes or until the onions and mushrooms have started to soften. Then add the diced tomatoes and cook for 1-2 minutes. Add salt and pepper to season. Remove from heat.
Cut the bell peppers in half lengthwise and place on a baking sheet. Arrange the peppers closely on the sheet to help prevent them from tipping over. You can also use rolled up balls of foil to help prevent the peppers from tipping over.
In a bowl, pour 1 container of Just Egg. Add the mushroom, onion and tomato mixture and mix thoroughly
Fill each pepper to nearly the top with the Just Egg mixture, and then top with the lentil and walnut sausage crumble.
Bake or 45 mins and allow it to cool for 10 minutes before serving.