Heat 1 Tablespoon oil in a large skillet. Add onion, red pepper, carrot and garlic. Saute 5 minutes. Remove mixture from pan and set aside. Keep pan warm.
Combine beans, breadcrumbs, vegetable mixture, Aminos, and cumin in a large bowl. Mash about half the beans with a potato masher, with the back of a spoon, or with a fork. Stir well to combine.
Slice bottom and top off of each green bell pepper. Remove seeds and membranes.
Add 1 Tablespoon olive oil to the pan. Slice each pepper into 4 rings. Saute in oil 2 minutes per side. Transfer rings to a parchment-lined baking sheet. Fill with black bean mixture, taking care to smash the bean mixture into each ring.
Bake at 350 for 20-30 minutes or until a nice crust forms.