COMBINE flour, granulated sugar, baking powder, and salt in mixing bowl; CUT in shortening till mixture resembles coarse crumbs.
MIX egg and milk; ADD all at once to flour mixture; STIR just till moistened.
To make streusel for muffins: COMBINE brown sugar, chopped pecans or walnuts, flour, ground cinnamon, and melted butter or margarine.
PLACE half of batter in greased muffin pans; SPRINKLE streusel mixture over, then TOP with remaining batter, filling pans 1/2 full.
BAKE at 350°, about 20 minutes.
1. May substitute walnuts for pecans
Per Serving (excluding unknown items): 355 Calories; 15g Fat (38.4% calories from fat); 5g Protein; 50g Carbohydrate; 1g Dietary Fiber; 43mg Cholesterol; 385mg Sodium. Exchanges: 1 1/2 Grain(Starch); 0 Lean Meat; 0 Non-Fat Milk; 3 Fat; 1 1/2 Other Carbohydrates.