Place black beans in large bowl and mash with potato masher or fork. Add meatless grounds, oat bran, carrot, 1/4 cup tomato paste, soy sauce, oregano, cumin powder, chili powder, garlic powder, and onion powder. Place half of mixture in prepared pan and press down firmly for even layer. Add remaining bean mixture to pan and press down firmly for even layer. Cover pan and bake for 30 minutes.