Heat oven to 350°F. Lightly grease a 12-inch pizza pan or line with parchment.
Whisk flour, baking soda, and salt in a bowl; set aside.
Cream butter, brown sugar, and granulated sugar until light and fluffy, about 2 minutes.
Beat in the egg, egg yolk, and vanilla until smooth and glossy.
Stir in the dry mixture just until combined; do not overmix.
Fold in most of the chocolate chips, reserving a small handful for topping.
Press dough evenly into the pan, leaving a slight rim at the edge. Scatter reserved chips and any mini chips on top.
Bake 16–20 minutes, until edges are golden and center looks just set.
Cool on a rack for 10–15 minutes. Slice into wedges and serve warm or at room temperature.