Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper. This helps prevent sticking and makes cleanup easier after baking.

In a bowl, add butter and peanut butter. Mix until smooth and creamy. This step creates a rich base for the cookies.

Add brown sugar and white sugar to the mixture. Beat until light and fluffy. This helps give the cookies a soft texture.

Crack in the egg and pour vanilla extract. Mix well until everything is combined. The batter should look smooth and creamy.

In another bowl, mix flour, cocoa powder, baking soda and salt. Stir well so everything blends evenly.

Slowly add dry ingredients to the wet mixture. Mix gently until a soft dough forms. Do not overmix the dough.

Fold in chocolate chips using a spatula. Spread them evenly throughout the dough for rich chocolate bites.

Scoop small portions of dough. Roll into balls and place on the baking sheet. Leave space between each cookie.

Bake for 10 to 12 minutes. The edges should be set and the center should stay soft for a chewy texture.

Remove cookies from oven. Let them cool on a rack. Serve warm or at room temperature for the best taste.