Combine the peanut butter and sugars in the bowl of a stand mixer on medium until smooth and fluffy.
Add the eggs one at a time followed by the milk and vanilla extract.
Sift the dry ingredients together in a separate bowl and stir lightly with a whisk until just combined.
Slowly add the dry ingredients to the bowl of the stand mixer and blend until everything is combined. ( Be careful not to overblend here)
Wrap the dough in plastic wrap and chill in the refrigerator for 45 minutes to 1 hour.
Preheat the oven to 375° F when you have about 15 minutes left in the chilling time.
Turn the dough out onto a powdered sugar-dusted surface once the chill time has elapsed and roll out to a 1½ inch thickness. Cut circle-shaped cookies out using a round cookie cutter.
Use a (sanitized) toy dinosaur to press footprints down into each cookie. You can also use things like shells or plastic bugs to make unique fossil shapes.
Place cookies on a parchment paper-lined baking sheet and cook for 10-12 minutes.
Let the cookies cool on the pan for 5 minutes and then move to a cooling rack to finish cooling completely.
You can use a cookie decorating brush and a little cinnamon to darken the footprints slightly or add a sandy texture to the cookies. ( Just don't overdo it because cinnamon can get a little overpowering quickly!)
Keyword cookie, dinosaur, fossil, kid-friendly, kids, peanut butter, snack for one
Peanut Butter Fossil Cookies printed from The Country Kitchen Witch https://www.countrywitchskitchen.com/peanut-butter-dinosaur-fossil-cookies/