Preheat the oven to 350°F and line baking sheets with parchment paper.

In a large bowl, cream together the softened butter and sugar until light and fluffy.

Add eggs one at a time, beating well after each addition. Mix in vanilla extract.

In a separate bowl, whisk together flour, cocoa powder, baking soda, and salt.

Gradually add dry ingredients into wet ingredients, mixing just until combined.

Fold in chocolate chips.

Drop spoonfuls of dough onto prepared baking sheets, spacing about 2 inches apart.

Bake for 10 to 12 minutes or until cookies are set around the edges.

Allow cookies to cool on baking sheet for 5 minutes before transferring to wire racks to cool completely.