Heat oven to 350°F. Generously grease a 12-cup Bundt pan.
Cut biscuit dough into bite-size pieces, about 4 per biscuit.
Stir granulated sugar and cinnamon in a large bowl. Toss dough pieces to coat; shake off excess.
Layer half the coated dough in the pan. Sprinkle with half the pecans, if using.
Melt butter in a small saucepan. Add brown sugar, vanilla, and salt; simmer 1–2 minutes until glossy and smooth.
Pour half the warm caramel over the dough in the pan. Add remaining dough and nuts. Pour on remaining caramel.
Bake 30–38 minutes until deep golden and bubbling in the center.
Cool 10 minutes. Invert onto a plate. Let set 5 minutes, then pull apart and serve warm.