Rinse and drain black beans. Using a medium sized pot, cook beans on medium heat for about 3-5 minutes.
Dice onion, minse garlic, cut carrots into slices and cut bell pepper into small pieces.
Add salsa, onion, garlic, carrots, and peas to black beans and cook for an additional 3-5 minutes.
Line the bottom of a large baking pan with 2 tortillas. Scoop out some of the bean mixture and create a layer approximately 1 cm deep. Sprinkle feta cheese on top of this bean layer. Add another 2 tortillas and sprinkle pieces of bell pepper on top. Pour another 1 cm layer of bean mixture down. Top with shredded Mozarella cheese.