Can I use fresh tortellini instead of frozen?
Yes, but reduce the cooking time. Fresh tortellini typically cooks in 2–3 minutes once added to the skillet, so check for tenderness earlier and avoid overcooking.
How do I prevent the sauce from breaking?
Keep the heat at medium-low once you add the cream and cheese, stir frequently, and avoid boiling vigorously after the cream is incorporated.
Can I make this ahead?
Prepare the beef and onion mixture ahead and refrigerate separately; combine with other ingredients and cook fresh for best texture, as the tortellini can absorb excess liquid if stored together.
What if I don't have beef broth?
Substitute with chicken broth, vegetable broth, or pasta water; all will work as a liquid base for the sauce.
Can I use fresh spinach or frozen?
Both work; use about 1 cup fresh spinach as listed, or ½ cup frozen spinach thawed and squeezed dry to avoid excess water in the sauce.