In stand mixer - or in a large bowl if using an electric mixer - cream butter, peanut butter, and sugar substitutes until fluffy.
Add eggs, milk, and vanilla, beat until everything is fully incorporated and smooth.
In a separate medium bowl, mix together remaining ingredients.
Slowly add this dry ingredients mix to the mixer bowl, and carefully mix until well incorporated and smooth.
Cover dough with plastic wrap, chill for 1 hour.
Making the Keto Peanut Butter Thumbprint Cookies
Preheat the oven to 350 F, line baking sheets with parchment paper.
Roll 1" balls of cookie dough, or use an ice cream scoop. You want to get about 30 cookies from the batch.
Arrange dough balls on a cookie sheet, leaving at least 2" between cookies - they flatten out a fair amount.
Gently press the tops of each slightly - flatten JUST enough to prevent the dough from rolling.
Use your thumb to form a round, shallow indentation in the center of the dough.
Fill each indentation with about 1 teaspoon of sugar free raspberry jam.
Bake for 11-13 minutes. Cookies will look puffy, but flatten out as they cool. Do not over bake!
Allow cookies to cool for 2 minutes before removing from baking sheets. You can transfer them to a cooling rack, if you like.Cool completely before storing in an airtight container.
Once cooled to room temperature, cookies can be stored in an airtight container for a few days on the counter, longer if in the fridge.
Notes
About 4.5 grams of carbs per cookie are coming from the allulose (deductible). Add that to the 1 grams of fiber, and you're left with about 2.5 net grams of carbs per cookie