the Foil
After about 1 hour, carefully remove the foil.
Steam can escape quickly, so keep your hands and face away from the opening.
Step 12: Finish Baking Uncovered
Return the casserole to the oven and bake uncovered for another 20 to 30 minutes.
The potatoes should become completely tender and the top should begin to brown around the edges.
Test the casserole by inserting a fork into the thickest potato layer.
If the fork slides in easily, the potatoes are done.
Step 13: Rest Before Serving
Remove the dish
