Blackberry-Peach Cobbler Bars

INGREDIENTS

• 1 cup butter, softened
• 1 cup firmly packed light brown sugar
• 1 1/2 cups granulated sugar, divided
• 4 large eggs
• 1 tablespoon vanilla extract
• 1 teaspoon baking powder
• 3/4 teaspoon table salt
• 3 1/4 cups all-purpose flour, divided
• 3 (6-oz.) packages fresh blackberries (about 4 cups)
• 4 cups peeled and sliced fresh firm, ripe peaches
• 3 tablespoons bourbon
• 1 cup roasted glazed pecan pieces