Ultimate Double Chocolate Chunk Cookie

Ingredients

• 1 cup (227 g) unsalted butter, softened to room temperature
• 1 cup (200 g) brown sugar, packed
• 1/2 cup (100 g) granulated sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 1 3/4 cups (220 g) all-purpose flour
• 1/2 cup (45 g) unsweetened cocoa powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1 cup (175 g) semi-sweet chocolate chunks
• 1/2 cup (90 g) white chocolate chunks (optional)