Biscuit Sticky Buns

Name: Biscuit Sticky Buns
Ingredients: Butter, for greasing; 4 cups all-purpose flour, plus more for dusting; 4 teaspoons baking powder; 1 teaspoon baking soda; 1 teaspoon salt; 12 tablespoons cold unsalted butter, cut into small pieces; 1 1/2 cups cold buttermilk or 6 tablespoons buttermilk powder; 3 tablespoons unsalted butter, softened; 1/4 cup granulated pure cane sugar; 3 tablespoons light brown sugar; 1/2 teaspoon ground cinnamon; 1/2 cup finely chopped toasted pecans, plus more for topping; 6 tablespoons unsalted butter; 1 1/4 cups packed light brown muscovado sugar; 1/2 cup heavy cream; Pinch fine sea salt