Sheet Pan Chocolate Chip Cookie Ice Cream Sandwiches

INGREDIENTS

2 1/2 sticks

unsalted butter, at room temperature

1 cup

light brown sugar, lightly packed

3/4 cup

granulated sugar

large eggs + 1 large egg yolk, at room temperature

2 tsp

vanilla extract

2 1/2 cups

all-purpose flour

2 tsp

cornstarch

1 tsp

baking soda

1 tsp

kosher salt

2 cups

semisweet chocolate chunks or chips (about 12 ounces)

1 1.5 quart container

vanilla ice cream, softened at room temperature for 15 minutes (see note)

Sprinkles and mini chocolate chips, for decorating