Preheat oven to 450 degrees F.
Wash potatoes and dry with paper towels.
Cut potatoes in half lengthwise, then cut each half into 4 wedges. Cut each wedge in half again depending on size of potato and desired size.
Place cut potatoes in a resealable bag and pour olive oil on top.
Seal bag and shake until potatoes are coated in olive oil.
In a small bowl, combine chili powder, garlic powder, onion powder, dried oregano, paprika, cumin, salt and pepper.
Pour spice mixture into bag, seal and shake to coat again.
Spray a baking sheet with nonstick cooking spray, and spread potatoes out in an even layer on the prepared pan.
Bake for 25-30 minutes, turning halfway through, until wedges are golden brown and crisp on the outside.