Heat the olive oil in a large skillet over medium-high heat. Add the bell pepper and onion and cook until the vegetables are softened, about 5 minutes. Stir in the chili powder, cumin, garlic powder, corn and black beans. Cook for an additional 2 minutes.
Lay one tortilla on a work surface. Spread 1/3 cup of the vegetable mixture over half of the tortilla. Fold the other half of the tortilla over to cover the filling. Repeat with remaining tortillas and filling.
Heat a large skillet over medium heat. Place one quesadilla in the skillet and cook until golden brown on both sides, about 4 minutes per side.