Can I make this casserole ahead of time?
Yes. Assemble the casserole (uncooked) up to 24 hours ahead, cover, and refrigerate. Add 5–10 minutes to baking time if baking from cold.
Can I substitute the cornbread muffin mix?
You can use homemade cornbread batter or a cornbread mix from another brand. Avoid using regular bread mix, as it won't yield the same texture.
What if I don't have sour cream?
Use Greek yogurt or Mexican crema as a 1:1 swap. Both add moisture and tang without changing the bake time.
How do I know when the cornbread is done?
The top should be golden brown and a toothpick inserted into the cornbread (not the beef layer) should come out clean, typically 30–35 minutes at 400°F.
Can I freeze leftovers?
Yes. Cool completely, wrap tightly in foil or transfer to an airtight container, and freeze up to 3 months. Reheat covered at 350°F for 20–25 minutes until warm.