Duff Bakes by Duff Goldman and Sara Gonzales is a fabulous book. There are a few recipes where nuts are prominent and I can't adapt them, but all in all I believe more than 95% of these recipes will work for my family.
We started out by trying the Chocolate Cream Pie with Oreo Crust and Marshmallow Meringue. (To be safe I just ate some of the filling, but my family loved the pie.
The crust is simple -- crushed Oreos and butter. The filling is a chocolate custard that uses both cornstarch and egg yolks. It is cooked in a double boiler. The meringue has traditional ingredients with melted marshmallows added. (I had never made meringue with these added, but it held its shape well and did not weep -- even by the second day.)
My family ranked this pie a keeper. Their second request was the Vanilla Birthday Cake, which is similar to a "Funfetti" cake. I will share how that turned out later this week.