Preheat the oven to 300F and line a large baking sheet with parchment paper.
In a large bowl, beat together the butter and sweeteners until well combined and fluffy. Beat in the vanilla extract and salt.
Beat in the almond flour until well combined, then transfer to the prepared baking sheet and pat into a rough rectangle. Top with another piece of parchment and use your hands or a rolling pin to press out to about 1/4 inch thick, as evenly as possible.
Sprinkle the top with the chocolate chips and pecans. Bake 15 to 20 minutes, until the edges are golden brown. Remove and turn off the oven.
Let cool 10 minutes, then return to the warm oven for another 20 minutes, keeping a close eye on it to make sure it doesn't become overly brown. Remove and let cool completely to crisp up.
Note: If the center pieces is not quite crisp after this, they can be returned to a warm oven to continue to crisp up.