Biscoff Brown Sugar Bars

INGREDIENTS

For the crust::

1 stick

unsalted butter, at room temperature

1/4 cup

packed light brown sugar

1 cup

all-purpose flour

salt

For the filling::

large eggs

1 1/4 cups

packed light brown sugar

1/2 cup

Biscoff spread, or other cookie spread

1/2 cup

all-purpose flour