Preheat oven to 425° F (218° C).
Mix the spices together in a small bowl, and set aside.
Line a baking sheet with parchment paper.
Place the diced potatoes, onions, and peppers into a large bowl.
Drizzle oil and pour the spice mixture over the potatoes, onions, and peppers. Stir well.
Spread out potatoes onto the prepared sheet pan.
Bake for 25 minutes, stirring once. Turn the oven temperature up to 475° F (246° C) and cook for an additional 10 minutes, until crispy.
Remove from oven and serve with Southwest Tofu Scramble or however you want.