Preheat oven to 400 F. Line a baking sheet with parchment paper. Split butternut squash down the middle & scoop out seeds & fibrous strings. Place the cut side down on baking sheet; roast until it becomes very soft & mushy. Remove from oven; allow to cool then scoop out flesh & place in a food processor. Blend until smooth with milk (or broth), salt & pepper. Adjust if necessary so you end up with a nice ‘sauce’ for the pizza. Set aside.
Caramelized Onions
Heat oil in skillet until hot. Add onion & sprinkle with salt. Cook & stir about 15 minutes or until moisture is evaporated & onion is soft. Reduce heat; sprinkle with vinegar. Cook & stir until golden. Stir in brown sugar; cook & stir until caramel brown in color.
Pizza Crust
In a medium bowl, measure dry ingredients for pizza crust. Make a well in center & add milk. Stir until dough leaves the sides of the bowl. With buttered hands, gently knead 5-6 times then press into one 14-inch pizza pan.
Pizza Assembly
Spread with ‘sauce’; sprinkle with mozzarella ( or nacho) cheese, onion, ham & pineapple. Top with remaining Gorgonzola (or Gouda) cheese. Bake for 20-25 minutes until crust is browned.