In a food processor, combine the almond flour, sweetener, and salt. Pulse a few times to combine. Scatter the butter pieces over top and pulse until mixture resembles coarse crumbs.
Press into the bottom of a 9x9 inch pan and bake 12 minutes or until the edges are just turning golden.
Pecan Pie Filling:
In a medium saucepan over low heat, melt the butter. Stir in the powdered sweetener and Yacon syrup and whisk until well combined. Remove from heat.
Whisk in the vanilla extract and cream. Add the eggs and salt and whisk until fully incorporated.
Scatter the pecans and chocolate chips over the crust and pour the filling overtop. Bake 20 to 25 minutes, until the filling is mostly set (if you want them gooey, make sure the middle still has a little jiggle to it when the pan is shaken).
Remove and let cool at least 30 minutes before cutting into bars.