Step 1: Cook the Tortellini : Bring a large pot of salted water to a boil. Add the tortellini and cook according to package directions (usually 3–5 minutes for fresh, 8–10 for frozen). Drain and toss with 1 tablespoon olive oil to prevent sticking. Set aside.
Step 2: Make the Garlic Butter Base : In a large skillet, melt butter over medium heat. Add minced garlic and sauté for about 1 minute until fragrant but not browned. Stir in crushed red pepper flakes (if using).
Step 3: Prepare the Lemon Ricotta Sauce : Reduce heat to low and whisk in ricotta cheese, lemon zest, lemon juice, and Parmesan. If the sauce is too thick, stir in a splash of reserved pasta water or heavy cream until smooth and creamy. Season with salt and black pepper to taste.
Step 4: Combine Everything : Add the cooked tortellini to the skillet. Toss gently to coat every piece in the lemon-ricotta sauce. Stir in chopped basil right before serving to preserve its freshness and flavor.
Step 5: Serve : Plate the tortellini and top with extra lemon zest, Parmesan, and fresh basil. Drizzle lightly with olive oil for extra richness, if desired.