Place butter and vanilla extract in a mixing bowl and beat with an electric mixer at medium speed until fluffy, about 2 minutes. Gradually add brown sugar and granulated sugar. Beat until well combined.
Add eggs one at a time, beating after each addition until incorporated. Add peanut butter and beat until combined.
Add flour, baking powder, and salt. Mix on low speed until just combined.
Roll dough into 1-inch-sized balls. Place on a cookie sheet or on Silicone Baking Pan. Flatten with a fork dipped in granulated sugar. Repeat with the fork turned perpendicular to the first marks to create a cross-hatch pattern.
Bake at 375°F for 7-8 minutes or until very lightly browned.