I start by heating the olive oil in a 12-inch sauté pan over medium heat. Then I add the thinly sliced shallots along with a pinch of kosher salt, and cook until they're soft and slightly translucent.
Once the shallots are mellowed, I put in both types of sliced mushrooms in a single layer so they brown nicely. After letting them cook undisturbed for about 5 minutes, I stir, season with salt, then add the garlic, crushed red chili, and freshly ground pepper, cooking until the mushrooms release their juices.
With the mushrooms softened, I raise the heat to medium-high and pour in the wine. I let it bubble for a couple of minutes so the alcohol cooks off, then stir in the butter until it melts into a silky sauce.
I turn off the heat and immediately add the grated Parmesan cheese and baby spinach. I gently stir until the spinach wilts and the cheese melts, creating a delicate, glossy sauce.
While the sauce simmers, I cook the pappardelle in a large pot of salted boiling water until al dente (fresh pasta only takes about 2–4 minutes, dried around 10–12). Then I drain and toss the pasta into the pan with the sauce, coating each ribbon with that rich, flavorful mixture.
To finish, I divide the pasta into bowls and sprinkle extra Parmesan on top. And of course, I pour myself a small glass of the same wine I used in the sauce — balance is everything.