Set a pot of water on the stove to boil for the gnocchi.
Heat the olive oil in a large skillet. Sauté garlic until fragrant; about 30 seconds. Add smoked sausage and cook until starting to brown.
Add the sliced peppers and cook for another 5 minutes, until tender.
Meanwhile, boil gnocchi until it floats, about 3 minutes. Drain and add to the skillet.
Add pesto and toss everything together. Season additionally with salt and pepper, if needed. Serve with a sprinkle of shredded Parmesan cheese.