Preheat the oven to 375 degrees(F).
In a small bowl, combine the corn starch, chili powder, salt, paprika, sugar, cumin, garlic and cayenne. Stir to combine. Set aside.
In a large mixing bowl add the jalapeno, sweet peppers, mushrooms, onions and pineapple.
Drizzle with the oil and toss with your hands to mix and coat the pineapple and veggies with the oil.
Now sprinkle the seasoning mix you made over the pineapple and veggies. Toss again to coat everything in the seasonings.
Pour the pineapple and veggies on to a large sheet pan. Spread out evenly in a single layer.
Bake for 15 minutes, remove from the oven and toss the pineapple and veggies with a spatula. Smooth back out evenly and bake for another 10-15 minutes or until everything has browned and is juicy. Remove from the oven and sprinkle with a pinch more salt.
Fill a tortilla with the pineapple and veggies and top with your favorite toppings.