2. Stir together flour, salt, and the 1 tablespoon granulated sugar. Set aside.
3. In large mixing bowl, beat egg slightly. Stir in yeast mixture and KELLOGG'S COMPLETE Wheat Bran Flakes cereal. Add margarine. Beat well. Mix in flour mixture. Cover lightly. Let rise in warm place until double in volume (about 1 hour).
4. Stir down dough. Divide in half. On lightly floured surface, roll out each half to an 11 x 7-inch rectangle.
5. Place cream cheese, the 1/4 cup granulated sugar, and the lemon peel in small mixing bowl. Beat until light and fluffy. Spread half the mixture over each rectangle. Sprinkle with walnuts.
6. Starting from long side, roll up dough like a jelly roll. Place rolls, seam side down, on lightly greased baking sheet. Slit each roll halfway through lengthwise.
7. Bake at 375° F about 25 minutes or until lightly browned. Remove from oven. Cool. Sprinkle with powdered sugar. Cut into diagonal pieces to serve.