Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Slice the chicken sausage into half-inch rounds and halve the baby potatoes, ensuring they are small enough for little hands.
Cut the bell peppers and yellow onion into bite-sized strips or chunks.
Place the sausage, potatoes, peppers, and onions onto the prepared sheet pan.
Drizzle with extra virgin olive oil and sprinkle with sea salt, black pepper, garlic powder, and dried oregano.
Toss everything thoroughly with your hands or tongs until evenly coated, then spread into a single layer.
Roast in the oven for 25 to 30 minutes, tossing halfway through, until the potatoes are fork-tender and the sausage is beautifully browned.
Let cool slightly before serving to ensure the temperature is safe for the toddlers.