Biscuit baking mix recipes.

I have done the first (canola oil) version with good results.

https://www.geniuskitchen.com/recipe/original-bisquick-baking-mix-copycat-357101
6 cups all-purpose flour (28 oz)
3 tablespoons baking powder
2 tablespoons powdered sugar
1 1⁄2 teaspoons table salt
3⁄4 teaspoon baking soda
9 tablespoons canola oil (4.5 fl oz)

https://www.budget101.com/recipes/3131-copycat-bisquick-recipe/
8 cups flour
4 Tbs. Sugar
4 Tbs. baking powder
4 teaspoons salt
1 cup shortening

https://melaniemakes.com/homemade-baking-mix/
5 cups flour
2 teaspoons salt
3 tablespoons baking powder
1 cup shortening

https://www.chowhound.com/post/alternative-bisquik-476813
various links here.