Preheat oven to 400°. In a large bowl, combine first six ingredients. In another bowl, whisk eggs, pumpkin and oil. Stir into dry ingredients just until moistened. Fill greased or paper-lined muffin cups one-third full. , For filling, beat cream cheese, sugar, egg and flour until smooth. Drop by tablespoonfuls into center of each muffin. Top with remaining batter. , For topping, in a small bowl, combine pecans, brown sugar and sour cream; spoon over batter. Bake 15-18 minutes or until a toothpick inserted in the muffin comes out clean. Cool 5 minutes before removing from pans to wire racks. Serve warm. Refrigerate leftovers.