Preheat oven to 350F.
Combine flaxseed and water, let sit until thickened
Combine sugars, salt and baking powder. Combine peanut butter and flax mixture. Add to sugar mix and stir until well combined. If the dough is sticky, add a little more sugar.
Roll into balls and place on a nonstick cookie sheet. Make an indentation into each cookie with your finger/thumb. You want the indentation deep enough so that it doesn't disappear while baking.
Bake 8-10 minutes, checking carefully after 8 minutes. These will burn easily so be careful!
Let cookies cool completely on the cookie sheet then remove to a plate or platter.
WIth a teaspoon, add jelly to the center of each cookie. Enjoy!
If you like, before putting the cookies into the oven, put 2 or 3 chocolate chips into the indentation in the cookie ball. Bake, cool and fill with jelly as usual. Delicious!