Preheat oven to 400 degrees
Cut the baby potatoes in half or quarter (depending on size) so that they are all the similar in size. Toss potatoes with a drizzle of olive oil, 2 cloves of minced garlic, parsley, and salt and pepper. Transfer to 1/3 side of a baking sheet pan and put in 400 degree oven to start baking while you prepare the sprouts.
Combine sprouts, onions, and remaining minced garlic with a drizzle of olive oil, toss to coat. Add to 1/3 of sheet pan. Bake for about 20-30 minutes.
While potatoes and sprouts are baking, slice the sausage in about 1-2 inch slices. Toss in your favorite BBQ sauce. When the potatoes and sprouts are about 10 minutes from being done (after about 20-25 minutes), add the sliced sausage to the sheet pan, and bake for another 10 minutes or until sausage is heated through.
You can use any sausage that you like, I just saw that this smoked chicken one had garlic so I was sold! It actually paired phenomenally with the Trader Joe's Sriracha Roasted Garlic BBQ sauce. If you have access to get it, do it!
You can swap out any vegetables that you like. Asparagus, carrots, and cauliflower also roast really nicely, you'll just need to adjust roasting times depending on the vegetable.
The veggies will take longer to roast than the sausage. Potatoes will take the longest so depending on what veggies you choose you'll just need to monitor the cooking time and how soft you want your veggies. If you buy fully cooked sausage, all you are doing is heating it through along with the sauce.