In a medium non-stick skillet, toss together the corn and olive oil over medium-high heat. Add ¼ tsp red chili flakes (or more if you like a little extra spice) and a sprinkle of salt and pepper.
Allow the corn to cook in the olive oil, stirring occasionally – This will take approximately 5-6 minutes. Remove and set aside when corn is tender and slightly browned.
Meanwhile, mix the lime juice, garlic, ¼ tsp red chili flakes, and a pinch of salt in a small bowl. Whisk until all ingredients are combined. Set aside.
In the skillet, combine black beans and chili-lime juice mixture. Heat the beans over medium heat and allow them to absorb the chili-lime mixture. This will take approximately 3 minutes.
Spoon the black beans and corn into warm tortillas and sprinkle with the sliced red onions and chopped cilantro.