Preheat the oven to 350-F.
Cut the frozen butter into chunks and add it to a food processor. Add the flour, sugar, and salt.
Pulse the food processor chunking up the butter and flour-sugar mixture, to create coarse crumbs. It should be the texture of large-grain sand.
Press the crumb into the bottom of an 8x8 baking dish. Bake it at 350-F for about 20 minutes.
Chop the pecans in the food processor until they are coarsely chopped. You can skip this step if you're using pre-chopped pecans.
Melt the butter and sugar in a small saucepan over medium heat.
Add the maple syrup, cream, and salt when the sugar has dissolved, then stir in the pecans.
When the base is golden brown, add the pecan topping and return the baking dish to the oven for 25-30 minutes or until set.
Let cool, cut, and serve!