Heat the olive oil in a large skillet over medium heat. Add the garlic and cook until fragrant, about 1 minute.
Add the chili powder, cumin, and smoked paprika and cook until the spices are fragrant, about 1 minute.
Add the mixed greens, red bell pepper, and yellow bell pepper and cook, stirring occasionally, until the greens are wilted and the bell peppers are softened, about 5 minutes.
Season with salt and pepper to taste.
Serve warm.
Interesting Facts
Mixed greens are a blend of different types of leafy green vegetables.