In medium mixing bowl, combine flour, yeast, sugar and salt; mix well. In saucepan over medium heat, heat sour cream, water and shortening to 120-130°F (shortening does not need to melt) then add to flour mixture. Add egg. Mix by hand until somewhat smooth.
Spread into greased 9 or 10-inch pie pan to make a crust. Spoon filling into crust; sprinkle with cheese.
Bake at 375°F for 30 to 35 minutes, or until light golden brown. Serve immediately.