1. Brush an aluminum foil-lined jelly-roll pan with 2 tsp. olive oil. Heat pan in a 425° oven 5 minutes.
2. Peel sweet potatoes, and cut into 3- x 1/2-inch strips. Combine strips, salt, chili powder, brown sugar, and remaining 1 tsp. oil in a large zip-top plastic freezer bag, tossing to coat.
3. Place strips in a single layer in prepared pan.
4. Bake at 425° for 30 minutes or until crisp, stirring every 10 minutes.