Golden Pecan Praline Yam Bars

GOLDEN PECAN PRALINE YAM BARS1 ¼ c. butter, melted1 ¼ c. sugar4 T. vanilla, divided2 ¾ t. kosher salt, divided3 1/3 c. flour1 t. baking powder1 ¼ c. rough chopped pecans2 (15-oz.) cans sweet potato puree4 eggs1 1/3 c. packed…