Preheat oven to 375°.

Add softened butter, 1 cup granulated sugar and brown sugar to a mixer bowl. Beat with an electric mixer until fluffy and light, about 2 minutes.

Add eggs and vanilla extract, beat until combined.

With the mixer turned off, add flour, cocoa powder, baking soda and salt.

Mix on low until ingredients combine, raise to medium and beat 1 minute.

Line rimmed baking sheets with parchment paper or lightly grease.

Add 1/2 cup granulated sugar to a small bowl. Use a medium- size cookie scoop to make 1 ½ inch balls and place about 2 inches apart on the lined baking sheets.

Use a cookie stamp or the bottom of a glass to smash the cookies.

Bake for 10 minutes. Remove from oven and cool for 3- 5 minutes on the cookie sheet.

Move to a wire rack to cool.