While your meat cooks, in a large skillet, heat oil over medium-high heat. Once oil is hot, add onion and bell pepper slices. Sprinkle spices over the top and generously salt and pepper. Cook, stirring occasionally, for 4 to 8 minutes, until edges are lightly charred and vegetables are tender crisp.
For softer vegetables, turn heat down to medium once the vegetables get a nice char so they don’t burn, and continue to cook until vegetables reach your desired level of doneness.