1. In a large bowl, combine the flour, sugar, cocoa, baking soda and salt.
2. Stir in the egg, water, oil, vinegar and vanilla.
3. Mix well.
4. Pour into greased 13x9 inch baking pan.
5. In a mixing bowl, beat cream cheese, peanut butter, 1/3 cup sugar, egg, and salt until smooth.
6. Stir in chocolate chips.
7. Drop cream cheese/peanut butter mixture by tablespoons onto the cake batter.
8. Use a knife to swirl the two batters together, making a marbled effect.
9. Sprinkle the cake with pecans and 1 tablespoon sugar.
10. Bake at 350 30-35 minutes, or until a toothpick comes out clean when inserted near the center.
11. Cool on a wire rack before cutting.
12. Refrigerate leftovers.