Here's one of my standard recipes, taken from the Food Allergy
Network annual supplements.

Baking powder biscuits (by Nancy Woo Walker)
2 cups flour (can sub rice or 1:1 w. wheat,  potato starch)
1 T sugar
1T baking powder
1 tsp salt
1/3 cup oil
2/3 cups water

(I add 1/2 T Calcium carbonate, and use my simplified directions)
Set oven 450F, mix dry, mix wet, mix together to make soft, but not
too sticky. Knead dough on floured board. roll or pat the dough to
1/2 inch thickness. cut into circles. place on ungreased cookie
sheet. bake 10-12 min or until the tops are golden brown