Preheat the oven to 350F and spread the pecan halves on a rimmed baking sheet. Bake 7 to 10 minutes, watching carefully, until nicely toasted. Let cool and then coarsely chop.
In a medium saucepan over medium heat, combine the butter, cream, and the sweeteners. Bring to a simmer, whisking to dissolve the sweeteners. Let cook 2 minutes.
Remove from heat and stir in the vanilla extract and salt, then stir in the chopped pecans. Serve warm over pancakes or ice cream (or cheesecake, or brownies, or waffles, or just eat it with a spoon!).