Cook your ravioli as per the packages instructions.
Heat a medium-sized skillet over moderate heat.
Melt the butter with the sage leaves until the butter is fragrant, nutty and slightly brown in color — about 3 minutes. The add the diced mushrooms and continue to cook until tender — about 5 minutes.
Add the cooked ravioli and carefully toss to evenly coat.
Sprinkle the ravioli with grated Parmigiano-Reggiano and freshly ground pepper.
Notes
Cooking time varies; it depends on how long it takes to cook your fresh ravioli. This can be done in less than 10 minutes.