Stir in halved cherry tomatoes and cook until they begin to soften, about 3 minutes more.
Drain the linguine, reserving a bit of the pasta water. Toss pasta with the sausage mixture and melted butter, adding reserved water as needed for sauce consistency.
Finish by adding salt, pepper, and red pepper flakes to taste. Garnish with fresh parsley before serving.
Notes
Pair with a side salad for a complete meal. A sprinkle of parmesan can enhance the flavor!