Heat 2 tablespoons olive oil in a large cast iron skillet or heavy pan over medium-high heat.
Add the sliced mushrooms in a single layer and let cook undisturbed for 4-5 minutes until golden brown on one side, then stir and cook another 3-4 minutes.
Push mushrooms to the side of the pan and add remaining 1 tablespoon oil. Add the bell peppers and onions, cooking for 5-6 minutes until softened and charred in spots.
Add the chickpeas, chili powder, cumin, smoked paprika, garlic powder, and salt to the pan. Stir everything together and cook for 2-3 minutes until chickpeas are warmed through and spices are fragrant.
Warm the tortillas in a dry skillet or in the microwave wrapped in a damp towel.
Serve the mushroom and chickpea mixture in warm tortillas with your favorite toppings.