Bring a large pot of salted water to a boil and cook the tortellini according to package instructions. I usually set a timer and keep tasting near the end to ensure they’re tender but not mushy.
While the tortellini cooks, heat 1 tablespoon of butter and olive oil in a skillet over medium-high heat. Add the sage and cook for about a minute until it turns crispy and fragrant, then set it aside.
Add another tablespoon of butter to the same skillet, along with the sliced mushrooms and minced garlic. Sauté for 5 minutes, stirring occasionally, until mushrooms are golden and caramelized.
Drain the tortellini and add it to the skillet with mushrooms. Toss in the remaining butter, crispy sage, and parmesan cheese. Mix gently until every piece is coated with buttery, cheesy goodness. Season with salt and pepper to taste and serve immediately.