Prep the Steak
Season steak with garlic powder, chili powder, cumin, salt, and pepper.
Grill, pan-sear, or broil to your preferred doneness (medium recommended).
Rest for 5 minutes, then slice thinly against the grain.
Sauté Veggies (Optional)
In a skillet with oil, cook onions and bell peppers until soft and caramelized.
Assemble the Quesadilla
On one half of a tortilla, add a layer of shredded cheese, followed by sliced steak, veggies, and more cheese. Fold the tortilla in half.
Cook
In a skillet over medium heat, melt a bit of butter or oil.
Toast quesadilla on both sides for 2–3 minutes until golden brown and cheese is melted. Press gently with a spatula to seal.
Serve
Let rest for 1 minute, then cut into wedges. Serve hot with your favorite dips.