Preheat oven to 350°F. Line 2 baking sheets with parchment paper; set aside.
In large bowl, using electric mixer on medium speed, beat butter with brown sugar, granulated sugar, baking powder, salt and baking soda until creamy and light, about 3 minutes. Beat in egg; beat in egg yolk and vanilla, scraping bottom and side after each addition.
Beat in half of the flour on low speed, then beat in remaining half. Stir in chocolate chips.
Using a 3 tbsp scoop, drop on prepared pan, top with dark chocolate and bake until golden brown, 11 to 13 minutes.
Bang baking sheet on counter twice to deflate cookies and create a crinkled texture; let stand for 2 minutes before transferring to cooling rack.
Notes
Tips
To measure flour, spoon it into a dry measure until heaping. Don’t pack or tap it on the counter to level; level with the straight edge of a knife. This is the “spoon and level” method, which is the most accurate method of measuring and helps produce consistently good baked recipes.
For a buttery, crunchier twist, turn this recipe into Chocolate Chip Toffee Cookies by swapping out half of the chocolate chips for toffee chips.
For a sweet and sour experience, turn this recipe into Cherry Chocolate Chip Cookies by stirring in ½ cup dried cherries.
Keyword Best Chocolate Chip Cookies, Chewy Chocolate Chip Cookies, Chewy Chocolate Cookies, Chocolate Chunk Cookies