Meanwhile, lightly spray cookie sheets with cooking spray. In large bowl, mix yeast, sugar and warm water; let stand 5 minutes. Add Bisquick mix, pecans, buttermilk, butter and pesto to yeast mixture, stirring until dry ingredients are moistened. Stir in flour as needed (up to 1/2 cup) until dough pulls away from side of bowl. On lightly floured surface, gently knead dough 2 to 3 times. Pat or roll dough to 1-inch thickness; cut with 1 1/2-inch round cutter. Place biscuits on cookie sheets.