I found a lot of GF alternate flours at our local Grocery Outlet. The good? They were pretty cheap for GF flours. The bad? They expire soon. So we got baking and trying out recipes. Here is one that worked pretty well. It's gluten-free, dairy-free, nut-free, and pretty tasty.
GF Banana Cake
1 1/2 c. sugar
4-5 very ripe bananas
1/4 c. softened butter
1/3 c. milk or milk substitute
1 1/2 t. baking powder
1 t. baking soda
1 t. salt
1 c. GF flour blend (the stuff that you substitute 1:1 for regular flour)
2/3 c. banana flour
Heat oven to 350°. Grease a 9x13 cake pan and set aside.
Cream sugar, bananas, and butter until very creamy and smooth. Add milk, eggs, baking powder, baking soda, and salt. Beat well. Stir in flours until well blended.
Spread in baking pan. Cook for 45-55 minutes, until cake is set and toothpick comes out clean.
Cool and frost as desired.
This makes a dense banana cake very similar to banana bread. You can add cinnamon or chocolate chips to it if you want.