Step 1: Preheat the Oven

1. Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

Step 2: Mix Dry Ingredients

1. In a medium bowl, whisk together the flour, cocoa powder, baking powder, and salt. Set aside.

Step 3: Mix Wet Ingredients

1. In a large mixing bowl, combine the granulated sugar, brown sugar, and vegetable oil. Mix until well combined.
2. Beat in the egg and vanilla extract until smooth.

Step 4: Combine Mixtures

1. Gradually add the dry ingredient mixture to the wet ingredients, stirring until just combined. If using, fold in the semi-sweet chocolate chips.

Step 5: Chill the Dough

1. Cover the dough with plastic wrap and refrigerate for at least 30 minutes to make it easier to handle.

Step 6: Shape and Coat Cookies

1. Once chilled, scoop tablespoon-sized portions of dough and roll them into balls.
2. Roll each ball in powdered sugar until fully coated. Place the coated balls on the prepared baking sheet, spacing them about 2 inches apart.

Step 7: Bake

1. Bake in the preheated oven for 10-12 minutes, or until the edges are set but the centers are still soft. The cookies will continue to firm up as they cool.
2. Allow the cookies to cool on the baking sheet for about 5 minutes before transferring them to wire racks to cool completely.

Step 8: Serve

1. Once cooled, serve your Chewy Chocolate Crinkle Cookies with a glass of milk or your favorite beverage.