Gooey Chocolate Chip Sandwich Bars

INGREDIENTS

2 cups

bittersweet chocolate chips

1 14 ounce can

of sweetened condensed milk

2 tsp

vanilla extract

2 cups

all-purpose flour

1 cup

quick-cooking or old-fashioned oats

1 tsp

baking powder

1 tsp

baking soda

1 tsp

kosher salt

2 1/2 sticks

unsalted butter at room temperature

1 cup

light brown sugar

1/2 cup

granulated sugar

large egg at room temperature

large egg yolk at room temperature

1 tbsp

vanilla extract

1 1/2 cups

bittersweet chocolate chips (or semisweet or white chips if you really like sweet)

1 1/2 cups

dried cranberries