Pre-heat oven to 350° F and line a baking sheet with parchment paper.
Using Mixer, Cream butter and 1 1/2 cups sugar together.
Add eggs one at a time and vanilla. Blend well
Combine cocoa, baking soda, salt, and flour together. Then slowly blend it into the creamed mixture.
Using a spoon as your measuring device. Scoop dough out and roll into balls. The dough balls should be about the size of a ping pong ball.
Roll the dough balls in the 1/4 cup of sugar you set aside, then place onto the lined baking sheet.
Bake for 8 minutes. The cookies will puff up while they are baking and then will flatten out once they have completely cooled. Leave cookies on the cookie sheet for a few minutes to "set" before moving them to a wire rack to finish cooling