Bake for 15 to 20 minutes in the preheated oven, or until cooked through. Meanwhile, cut the baguette in half lengthwise, and remove some of the bread from the inside to make a well for the meatballs. Brush with olive oil, and season with garlic powder, onion powder, salt and pepper. Slip the baguette into the oven during the last 5 minutes of the meatball’s time, or until lightly toasted.