Preheat oven to 375 degrees F.
In large mixing bowl, with electric mixer, beat margarine and sugar until light and fluffy; add flour, nuts, oatmeal, baking powder and cinnamon. Mix well.
On lightly greased 12-inch pizza pan or baking sheet, press dough into a 12-inch circle, forming rim around edge. Bake 10 to 12 minutes, or until golden brown. Cool.
In small mixing bowl, with electric mixer, beat cheese until fluffy; beat in yogurt and vanilla. Spoon evenly over cooled crust.
Arrange fruit on top. Chill before serving. Refrigerate leftovers.
* Use stick margarine or real butter. Do not substitute reduced-fat spreads; their higher water content often yields less-satisfactory results.