Heat an iron skillet or grill pan until hot. Add tortillas and heat. Wrap in foil to keep warm.
In the hot skillet: Cook peppers until blistered — about 8 minutes, turning them 3 or 4 times. Transfer to a serving plate. Add onion in one layer. Lightly blacken. Turn and grill until limp (about 2 minutes total). Transfer to serving plate. Coat pan with cooking spray. Grill tomatoes for 1 minute per side. Transfer to the plate with the peppers and onion. Wipe the pan. Return it to the heat.
Add oil to pan. Add the beans, cumin and oregano. Cook, mashing the beans, about 1 to 2 minutes. Mix in lime juice. Season with ground pepper.
Among the tortillas, divide the beans, peppers, onions, tomato slices, salsa and cilantro. Fold the tortillas and serve.