Dough
2 packages dry yeast
1/3 cup warm water
1 teaspoon granulated sugar
1 cup margarine
2 1/2 cups all-purpose flour
4 eggs, separated

Cheese Filling
3 (8 ounce) packages cream cheese
1 cup granulated sugar
1 teaspoon vanilla extract

Streusel
1 cup granulated sugar
1 cup all-purpose flour
1 stick (1/2 cup) margarine

Preheat oven to 350 degrees F.

In small bowl, mix yeast with water and 1 teaspoon granulated sugar, set aside.

In a large bowl, cut margarine into flour as for pie dough until mixture resembles small peas. Add egg yolks and yeast mixture and beat to blend. Let rise in warm place until doubled in size.

Meanwhile, in a mixer bowl, combine cream cheese, 1 cup sugar and vanilla extract, beating well until smooth.

Roll out half of dough mixture on a cookie sheet. Spread with cream cheese mixture over top evenly.

Roll out other half of dough and cover cream cheese filling.

Beat egg whites and spread on dough.

In a bowl, combine streusel ingredients and mix well. Sprinkle over dough. Let rise for 1 hour.

Bake for 30 minutes, remove from oven and drizzle with glaze mixture made from confectioners' sugar and milk if desired.