Cookie Dough Billionaire Bars

Ingredients:

For Shortbread:
2 cups (1 lb or 4 sticks) butter, softened
1 cup sugar
1/4 cup light brown sugar, packed
3 3/4 cup all-purpose flour
1/2 teaspoon salt

For Caramel:
2 cups sugar
12 tablespoons butter
1 cup heavy cream
1 tbsp fleur de sel or fine sea salt

For Cookie Dough:
1 cup (2 sticks) butter, softened
1/2 cup sugar
1 cup light brown sugar, packed
2 tablespoons heavy cream
1 tablespoon vanilla extract
1 1/2 cups all-purpose flour
1/2 teaspoon salt
1/2 cup mini semisweet chocolate chips

For Chocolate Ganache:
1 1/2 cups dark chocolate chips
1 cup heavy cream
1 tablespoon vanilla extract