On a large sheet pan place the gnocchi, tomatoes, sausage, and garlic. Toss them together to mix them evenly.
Pour in the 1/2 C of chicken stock. Then place the broccolini throughout the pan. Drizzle the olive oil over the top and sprinkle with the salt.
Place in the oven on the center rack and cook for 20 minutes. Stir the ingredients on the pan after 10 minutes, slightly crushing the tomatoes with the back of your spoon to create a nice sauce.
Put the broiler on and move the pan closer to the top of the oven. Cook for 4 minutes more to brown the tomatoes.