Make the caramel sauce according to the directions and set aside to let cool. Preheat the oven to 325F and grease an 8x8 inch metal baking pan.
In a large bowl, beat the butter with the sweeteners for 2 to 3 minutes, until lighter and fluffy. Beat in the egg, egg yolk, and vanilla extract, until well combined.
Add the almond flour, baking soda, and salt, and beat until well combined. Stir in the white chocolate chips.
Spread the batter in the pan. Dollop about half the caramel sauce over the batter and swirl in with a knife.
Bake 25 to 30 minutes, until the edges are golden brown and the center is mostly firm but still a little gooey (it can seem a bit wet but some of that is the caramel sauce).
Remove and let cool completely in the pan. Cut into bars and drizzle with more caramel sauce, if desired (you may need to re-warm the caramel gently in a pan).