Slice bell peppers into thin strips
Slice onions into thin strips
Heat a skillet over medium-high heat
Add oil to the skillet
Add the onions and cook until slightly softened
Add the bell peppers
Sprinkle with salt
Add black pepper
Add garlic powder
Add chili powder
Add cumin
Stir frequently until tender-crisp
Cook until lightly charred in spots
Remove from heat
Serve warm