Step 1
Bring a large pot of water to a boil for the pasta.
Step 2
In a large skillet, heat the oil, two turns of the pan, over medium-high. Add the sausage. Cook, occasionally stirring and breaking up the meat with a spoon, until lightly browned, 7 to 8 minutes. Add the garlic and stir for a minute. Add the wine. Reduce heat to low. Let simmer while the pasta cooks.
Step 3
Salt the boiling water; add the pasta. Cook until 1 to 2 minutes shy of the package directions. Scoop out about 1 cup of the pasta cooking water, then drain.
Step 4
In a small skillet, melt the butter over medium heat. Add the sage leaves. Cook until browned, about 4 minutes. Transfer the leaves to a paper towel. Remove the skillet from heat. Reserve the brown butter.
Step 5
In a large bowl, combine the ricotta, Parm, and parsley. Season with salt, white pepper, and nutmeg. Stir the pasta, cooking water, sausage, and browned butter into the cheeses. Transfer to a platter or divide among shallow bowls. Top with the fried sage.