Key Lime Pie Bars

INGREDIENTS

Crust

1/2 cup

unsalted butter, melted

1 cup

graham cracker crumbs

3/4 cup

light brown sugar, packed

1 tbsp

cornstarch

salt, optional and to taste

Filling

1 14 ounce can

sweetened condensed milk

large egg

1/2 cup

lime juice (freshly squeezed Key lime juice is optimal; use regular limes if necessary, or substitute with bottled lime juice only if you must)

1/2 cup

sour cream (lite is okay)

up to 1/2 cup granulated sugar, optional and if necessary, see directions

thinly sliced limes for garnishing, optional