Bring a large pot of salted water to a rolling boil, then add your pasta and cook according to package directions until just under al dente—it'll finish cooking when the sauce coats it. I always pull pasta one minute early because it continues cooking when you toss it with hot sauce, and nobody wants mushiness in their beautiful creamy mushroom pasta summer dinner.

While water heats, warm a large skillet over medium-high heat and add the olive oil. Once it shimmers slightly, add your chopped mushrooms without stirring for a full minute—this develops a golden-brown surface that caramelizes the natural sugars. I learned this trick from a sous chef who swore by the patience moment; don't crowd the pan or they'll steam instead of sear.

After that first minute, stir the mushrooms and cook another four to five minutes until they release their moisture and it evaporates almost completely. You'll notice the bottom of the skillet will have stuck-on bits that look dark—that's your flavor foundation, so don't panic or scrape it away. This is the moment most home cooks rush, and that's why their elegant mushroom pasta tastes flat compared to this version.

Reduce heat to medium and add your butter, then immediately add the chopped onion and minced garlic, cooking for two minutes until fragrant but not browned. The butter's foaming action tells you it's hot enough; if it's just sitting there silent, your pan needs another thirty seconds.

Pour in the vegetable broth and dried thyme, then scrape that stuck-on fond from the pan bottom with a wooden spoon—this deglazing step is where your beautiful creamy mushroom pasta summer sauce actually gets its umami backbone. Let it bubble for three minutes, which allows the thyme to fully bloom and the broth to reduce slightly.

Add the heavy cream and mozzarella cheese, stirring constantly for about two minutes until the cheese melts completely and the sauce coats the back of your spoon. This is a vulnerability admission: I once walked away during this step to grab plates, and the cheese split into separated greasy puddles. Stay present.

Add the hot drained pasta directly to the skillet, tossing continuously for about one minute so every strand gets coated. The starch from the pasta water already on the noodles helps emulsify the sauce and makes it cling instead of sliding off.

Turn off the heat, then scatter your torn fresh basil and grated Parmesan over the top, folding gently just twice—this keeps the basil vibrant green instead of bruised and dark. Taste for seasoning and crack fresh black pepper generously over each plate.