Preheat the oven to 350F and line a baking sheet with parchment paper. Set aside and make the cookie dough.
First, add vegan butter and ½ cup of sugar to a mixing bowl. Use an electric mixer to cream together until fluffy, about 1-2 minutes.
Next, add the flax egg and vanilla bean paste to the bowl and mix with the butter and sugar.
Add in the all-purpose flour, baking powder, and salt. Then, mix together until a thick dough forms. It will start off crumbly but will become thick and stick together after a few minutes of mixing.
Use a cookie scoop to scoop out 18 evenly-sized cookies. Roll each cookie dough ball between your palms to form a round ball. Then, roll each ball in a bowl with the remaining ¼ cup of sugar that was set aside so that each dough ball is coated in sugar.
Place the cookie dough balls on the parchment-lined baking sheet. Then, use your thumbs or a cocktail muddler to form a small indent in the center of each cookie.
Add ½ teaspoon of jam to the center of each cookie. Then, add the tray of cookies to the oven and bake for 11-12 minutes.
Remove the tray of cookies from the oven and let them cool for about 5 minutes. Then, move to a wire rack to continue cooling. Once the cookies are cooled and the jam has set, serve & enjoy!