Now, fold your bias tape over to the back side, encasing the raw edge. Pin as you go. Bias tape folded over to the back side: This is what my pinning looks like. I slip the pins under the bias tape on the top side and make sure it catches the bias on the back.
Baking soda is pure sodium bicarbonate. When baking soda is combined with moisture and an acidic ingredient (e.g., yogurt, chocolate, buttermilk, honey), the resulting chemical reaction produces bubbles of carbon dioxide that expand under oven temperatures, causing baked goods to expand or rise.
You can use baking powder in place of baking soda, but this will generally yield a puffier, less crisp cookie. Use double-acting baking powder as your baking soda substitute for the best cookie results, since the single-acting variety may not have enough power to help the cookies rise properly.