In a small bowl, combine chili powder, cumin, garlic powder, salt, and pepper.
Coat steak strips thoroughly with half of the spice mixture.
Heat 1 tablespoon of olive oil in a large cast-iron skillet over medium-high heat.
Sear the steak strips for 3 minutes until browned and cooked to desired doneness; remove from pan.
Add the remaining oil to the skillet and sauté peppers and onions for 6 minutes until tender and slightly charred.
Stir the remaining spice mixture into the vegetables.
Divide the cooked quinoa and black beans evenly among four meal prep containers.
Top each bowl with equal portions of the seared steak and fajita vegetables.
Garnish with fresh cilantro and serve with lime wedges.