Instructions: Heat oven to 375 degrees F. Grease 18 muffin cups or line with paper baking cups. In small bowl, combine 1/4 cup flour and brown sugar; blend well.

Using pastry blender or fork, cut in 2 tablespoons margarine until mixture resembles coarse crumbs. Set aside. Lightly spoon flour into measuring cup; level off. In large bowl, combine 2 cups flour, sugar, baking powder, baking soda, and salt; blend well. Add sour cream, 1/2 cup margarine, milk, vanilla, and egg; stir just until dry ingredients are moistened. Fold in macadamia nuts and chocolate chips. Fill greased muffin cups 3/4 full.

Sprinkle each with 1 1/2 teaspoonfuls streusel mixture. Bake at 375 degrees for 18 to 20 minutes or until toothpick inserted in center comes out clean.

Remove from muffin cups immediately. Serve warm.

HIGH ALTITUDE: Above 3500 feet: Increase flour to 2 cups plus 2 tablespoons. Bake as directed.

If you would like to email yourself the recipe for later use, or share the recipe with your friends or family, enter the email addresses below and this recipe will be emailed to you and others as well.