Oatmeal Cookies with Raisins, Dates, and Walnuts

• 2 cups all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon ground cinnamon
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt

• 3/4 cup (1 1/2 sticks) unsalted butter, room temperature
• 1/4 cup solid vegetable shortening, room temperature
• 1 cup sugar
• 1 cup (packed) dark brown sugar
• 1/4 cup honey
• 2 large eggs
• 1 tablespoon vanilla extract
• 3 cups old-fashioned oats
• 1 cup raisins
• 1 cup chopped pitted dates
• 1 cup chopped walnuts