Preheat oven to 425 degrees. Line a baking sheet with aluminum foil.
Cut each sausage link into 4 pieces. Leave uncut if you are placing on hoagie rolls. Place in large bowl.
Cut peppers and onions and place into bowl with sausage.
If adding potatoes, you need to pre-bake them in microwave for 5-7 minutes. This partial baking will allow them to cook completely along with the other ingredients. Cut them in 16th and add to sausage-vegetable mixture.
Combine olive oil, garlic and seasoning. Pour over sausage, vegetables & potatoes and toss to coat well.
Spread mixture on prepared sheet pan, making sure to keep in single layer.
Bake in oven for 30-35 minutes, turning after first 15 minutes.