The dish I most frequently make for something like this is a sweet potatoe casserole, a favorite of our family. While I got the recipe from my mother-in-law over 20 years ago, she now says she doesn't remember anything like it, and wanted me to write it up.
I realize now that I need it that I never measure any of the quantities used, and I'll have to wait until I make it again to try to measure, but here's the description:
I use a ceramic dish, about 4 inches high and 9 inches around, but any baking type dish works well.
Unless I'm particularly over-supplied with time for preparation, I usually use canned sweet potatoes, which have the advantage of being already cooked.
I use butter because I really like it, but a more vegan-friendly oil can be substituted with no loss of quality.
The only un-typical ingredient is one Granny Smith apple, peeled and cored, with about three fourths of it diced and the last fourth sliced into arcs.
Coat the baking dish bottom and sides with butter. Mash the cooked sweet potatoes and spread a small quantity across the bottom of the dish. Spoon brown sugar into a thin even layer. Add a hefty shaking of cinnamon and some ground cloves if you like cloves (I do).
Now another layer of mashed potatoes, thin but enough to cover. Then a layer of diced apple along with a few pats of butter and perhaps a scattering of salt. Repeat layers of potatoes, sugar, spices, potatoes, apples, butter until you run out of space or potatoes, making the potatoes the top layer.
Arrange the apple slices however you like on the topmost part, and bake at 350 for anywhere between 20 to 45 minutes.
At no point is precision required.
Handy at pot lucks because, while it's better warm, it's pretty good cold too. And it reheats well the next day.
Next time I make it I'll try to note quantities, and perhaps take a photo.