Prepare pizza dough (use your favorite recipe!)
Melt together olive oil and butter. Lightly brush on the bottom of your deep dish pizza pan, or on a regular pizza pan.
If making deep dish pizza, press the dough into the pan, and push the edges of the pizza up the sides.
Thinly slice potatoes until you have about 20 slices.
Place potatoes in bowl, spray with cooking spray, and season with rosemary and salt. Lightly fry until crispy in a skillet.
Mix together alfredo sauce and ranch dressing.
Mix together the cheddar and mozzarella.
Spread a thin layer of sauce on pizza dough (a little bit goes a long way), then layer the toppings as follows -- potato, bacon, then cheese. Add chives on top if desired.
Cook according to dough instructions. We used the pizza dough from Papa Murphys and it was done in about 15 minutes.