Prepare a cookie sheet with parchment paper. Spray some oil if needed - depending on whether your parchment paper sticks to baked goods or not, this may not be necessary. Set aside.
In a small mixing bowl, add the sugar-free chocolate chips and melted coconut oil. I prefer t measure my coconut oil melted for more precision in baking. That's up to you, I melt about 2 tablespoons in a small bowl in the microwave and measure the liquid oil before adding it to the chocolate chips.
Melt the chocolate chips with coconut oil in the microwave, by 30 seconds burst, stirring between to prevent the chocolate from burning. Set aside.
Meanwhile, in a medium mixing bowl, beat egg, sugar-free crystal sweetener, vanilla essence, baking powder, and salt. It should not take more than 20 seconds.
Stir in the melted chocolate mixture. The mixture will thicken, stay shiny, and that is what you want.
Now pour in the almond flour and unsweetened cocoa powder. Combine with a spoon until fully incorporated. It should not take more than 1 minute. Don't over mix it to prevent the batter from drying out. The batter will thicken again and will look like a brownie batter, thick but still runny. If your almond flour is coarse, you can also see some tiny bits of almond flour. It's fine.
Stir in the chopped pecan nuts or chocolate chips regarding your taste. Choose your option.
Spoon out the batter on the prepared cookie sheet. You should make 6 large cookies out of this dough. The cookies will expand a lot while baking, so leave some space - about 4 cm between each cookie. I made 2 rows of 3 cookies on my cookie sheet.
Bake for 10-14 minutes or until the edges are cooked. The middle stays soft and that is normal. I found 12 minutes to be perfect for a brownie texture.
Remove the cookie sheet from the oven, cool down for 10 minutes on the sheet.
Transfer your cookies on a cooling rack using a spatula that you slide under each cookie to prevent them from breaking. They are still soft.
Cool down for 10 more minutes on the rack.
Store in a cookie jar for up to 5 days. The texture is soft and close to brownie when fresh. The texture changes the next day, becoming chewier in the center and crispier on the border.