Heat oven to 400 degrees F. Grease a baking sheet.
Unroll dough into an 8x12" rectangle. Cut lengthwise into 4 strips. Roll each strip into a 16" rope; to form a pretzel and transfer to baking sheet.
Mix together the streusel ingredients, the flour, brown sugar, and the butter until crumbly. Brush pretzels with egg then sprinkle with streusel. Bake until puffed and golden , about 20 minutes. Dust with powered sugar if desired.