Cook and drain penne pasta to al dente according to package directions, reserving 1/2 cup of cooking water.
Meanwhile, in a large deep skillet, heat olive oil and garlic over medium heat just until fragrant, about 2 minutes.
Add in cherry tomatoes. Cook and stir until tomatoes burst, smashing them with the back of the spoon as they cook.
Continue to simmer the sauce until slightly thickened, about 3 minutes.
Stir in 2 tablespoons of fresh sliced basil and the sliced chicken sausage, turning to coat the sausage well. Reduce heat to medium low and simmer for 10-12 minutes or until the sausage reaches an internal temperature of 165 degrees.
Add cooked penne pasta along with the reserved cooking water, stirring to combine well. Serve with remaining fresh basil and grated Parmesan cheese.