Roll the pizza dough into a 14-by-16-inch rectangle. With the longer side facing you, cut the dough into 3 even pieces horizontally. Sprinkle the chocolate chips, brown sugar and cinnamon evenly over each piece of dough, leaving a 1/2-inch border around the edges. Roll each piece of dough into a long tube and pinch along the seam to seal. Twist into a pretzel shape and place on a parchment-lined baking sheet. Repeat with the remaining 2 pieces of dough.
Brush each pretzel with the egg yolk. Sprinkle evenly with the salt. Bake until golden brown, about 25 minutes.