Cookie Ice Cream Sandwiches (Like a Chipwich!)

The method's theirs. Go give them the click.

Ingredients

2 and 1/4 cups (281g) all-purpose flour (spooned & leveled)
1 and 1/2 teaspoons cornstarch
1 teaspoon baking soda
1/2 teaspoon salt
3/4 cup (12 Tablespoons; 170g) unsalted butter, softened to room temperature
3/4 cup (150g) packed light or dark brown sugar
1/2 cup (100g) granulated sugar
1 large egg + 1 egg yolk, at room temperature
2 teaspoons pure vanilla extract
1 and 1/4 cups (225g) mini semi-sweet chocolate chips
3 cups (about 540g) vanilla ice cream (or your desired flavor)
1 cup mini chocolate chips (180g), sprinkles (150g), or finely chopped nuts (100g)

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