Preheat oven to 350°F

Spray casserole dish with cooking spray

Chop yellow bell pepper, onion, and cilantro

Rinse and drain black beans

Drain tomatoes

Heat canola oil in skillet on medium heat

Add bell pepper, onion, garlic, and chili powder to preheated skillet

Cover and cook for 5 minutes, stirring often

Add beans

Cook for 5 minutes

Combine tomatoes, cilantro, and red-pepper flakes in mixing bowl

Microwave tortillas for 1 minute

Place equal amounts of bean mixture onto each tortilla

Roll each tortilla into a tube

Place tubes, seam side down, into casserole dish

Cover tortillas with tomato mixture

Cover the casserole dish tightly with foil

Bake for 20 minutes in preheated oven

Remove foil

Scatter cheese over enchiladas

Bake for 10 more minutes

Serve