Preheat oven to 350 degrees and grease a 9x13 baking dish. In a large bowl, beat the butter with the white and brown sugar until fluffy. Add egg, almond extract, and salt and mix until combined. Add the flour and mix thoroughly. Spread mixture into the prepared pan.
Bake for 13-15 minutes or until edges are golden brown. Sprinkle bars generously with chocolate chips immediately after baking and let them sit to melt. You can stick the pan back into the oven for a couple of minutes to speed this up. Once chips have melted, spread the chocolate evenly on top and sprinkle with sliced almonds.