Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Dice the red potatoes into small 1/2-inch cubes to ensure they cook quickly and evenly.
Slice the chicken sausage into 1/2-inch rounds and chop the bell peppers into bite-sized pieces.
Place the potatoes, sausage, and peppers directly onto the prepared sheet pan.
Drizzle with olive oil and sprinkle the garlic powder, dried oregano, sea salt, and black pepper over the top.
Toss everything together with your hands or a spatula until the ingredients are well-coated in oil and spices.
Spread the mixture into a single layer, ensuring the pieces aren't too crowded so they can roast rather than steam.
Bake for 25-30 minutes, tossing the ingredients halfway through, until the potatoes are tender and the sausage is golden brown.