To make sauce, in a small saucepan, melt butter. Add minced garlic, stir and cook for 1 minute. Add flour, cook for 1 minute. Add heavy cream and chicken broth, whisk. As mixture thickens, slowly add parmesan, whisk until smooth. Sprinkle in salt and pepper. Remove from heat and let cool for 10 minutes. Add ranch, mix until incorporated.
Spread sauce evenly over pizza peel, leaving about 1 1/2 inches around the edge for the crust. Sprinkle shredded cheeses on top. Then place cooked/diced chicken and bacon on top, evenly dividing it. Add raw tomatoes and onion. Sprinkle oregano, red pepper, salt and pepper over entire pizza.
Bake for 10-12 minutes at 500 degrees. Remove, let cool for 5 minutes, slice and serve.