My uncle always made these on cool weekend afternoons, and the aroma would fill the whole house. I still can’t believe something with only 4 ingredients could turn out so comforting and delicious.

Step 5: Optional Crisp Finish
For extra browning, carefully open the tops of the packets and bake for another 5–10 minutes.

Tip: Opening the packets at the end allows some moisture to evaporate, giving the sausage and onions a richer roasted flavor.