Line a 9x9-inch baking dish with parchment paper.
Melt butter, monk fruit sweetener, and vanilla extract in a non-stick skillet over medium heat until sweetener is dissolved.
Add the pecans and allow to boil for 2 to 3 minutes until mixture turns a light brown color.
Pour mixture into baking dish carefully and spread pecans evenly with the back of a spoon.
Sprinkle with coarse sea salt.
Allow to cool completely until solid all the way through.
Break into pieces and store in an airtight container for up to 2 weeks.