Dough
3 cups all purpose flour
1/2 cup unsalted butter
1/3 teaspoon salt
1 egg
1/3 cup fresh milk
1/2 teaspoon vanilla extract
For Fillings
2 cups Panko seasoned breadcrumbs
1/4 cup all purpose flour
1 cup brown sugar
1 cup condensed milk
1/4 cup margarine or unsalted butter
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2 tablespoons instant dry yeast
1/2 cup lukewarm water
1 tablespoon white sugar