To help remove a little of the starch (and keep the white potatoes from turning brown), place the diced potatoes into cold water for 5 minutes. Drain and pat dry. It's important to get them as dry as much you can so that they will crisp up.
2 medium sweet potatoes, 2 medium russet or Yukon gold potatoes
Meanwhile, preheat the oven to 400F and add 1 tablespoon of olive oil to a large sheet pan (13x18" is best). Place the potatoes and sweet potatoes on the tray in an even layer. Toss the potatoes with the olive oil to coat.
2 tablespoons olive oil
Sprinkle the seasonings over all the potatoes. Cook for 10-15 minutes until the potatoes are tender.
1 teaspoon onion powder, 1 teaspoon garlic powder, ½ teaspoon paprika, Salt and black pepper
While the potatoes cook, add 1 tablespoon of olive oil to a large skillet over medium heat.
Once hot, add the add the peppers and onions to the skillet and cook until tender.
1 cup onion, 1 cup bell pepper
Remove the tender potatoes from the oven and add them to the skillet. Turn the heat up to medium high to help the potatoes brown.
Once you are satisfied with the crispiness, add the fresh garlic to the center of the skillet and cook 1-2 minutes until fragrant.
2 cloves garlic
Stir to combine the garlic with all the rest of the vegetables.
Taste and adjust seasoning as desired; serve hot.