Leave room to brown.
A small skillet needs mushroom batches, which adds time.
Find a recipe Penne with browned mushrooms and a light cream Parmesan sauce. Cook the pasta separately so mushroom browning and sauce thickness stay easier to control.

Recipe draft · Reviewed editorially, not kitchen tested by us. Prep: about 10 minutes. Cooking: about 25 minutes. Times vary with equipment and ingredient size. Contains wheat and milk. Check packaged ingredients for other allergens.
Boil penne in salted water following the package timing. Reserve ½ cup (120 ml) cooking water before draining.
Taste a piece near the end; it should not have a hard, chalky core.
While the pasta cooks, heat oil and butter in a large skillet over medium heat. Add mushrooms and cook for about 10 to 12 minutes, stirring occasionally.
Let released liquid evaporate before expecting browned edges. Work in batches if crowded.
Lower the heat, add garlic and stir for 30 seconds. Stir in cream and pepper, then simmer gently for about 2 minutes.
Garlic should smell fragrant rather than turn dark.
Remove from the heat. Add pasta and Parmesan gradually, tossing with a splash of reserved water. Add more water a tablespoon at a time until lightly coated.
A thin sauce should cling to the penne instead of collecting as a dry paste.
Adjust salt after adding cheese, fold in optional parsley and divide between four bowls.
Serve promptly; pasta continues to absorb sauce while standing.
A small skillet needs mushroom batches, which adds time.
Fine shreds melt more evenly when the pan is off direct heat.