As the air cools and everyone's thinking about pumpkins, nothing is more satisfying than the warm smell of oven-baked sweets. Here's our favorite recipe for sweater-weather pumpkin muffins: 3 cups all-purpose flour (white, wheat, or a mix) 1 tablespoon + 2 teaspoons pumpkin pie spice 2 teaspoons baking soda 1 1/2 teaspoons salt 3 cups…