Preheat the oven to 450 degrees F and and lightly grease a 14-inch pizza pan with cooking spray.
Lightly dust your hands with flour and carefully stretch the pizza dough into a 14-inch circle. Pick up the dough and work around the edges, gently pulling and letting gravity help you, then lay the stretched dough flat onto the pan.
Prebake the dough for 4 minutes. While it's in the oven, add mozzarella cheese, cheddar cheese, chicken, and crumbled bacon to a large bowl and toss gently to combine.
Remove pizza dough from the oven. Top with 1/3 cup of the spicy ranch sauce, spreading it in an even layer and leaving about a quarter inch to a half inch crust around the edges. Top with the cheese, chicken, and bacon mixture. Then top with sliced jalapenos, red onion, and a sprinkle of sea salt.
Bake until cheese is bubbly and crust is golden-brown, about 12 minutes.
Transfer pizza to a cutting board. Drizzle about 2 to 3 tablespoons of spicy ranch sauce over the pizza, then slice and serve immediately. Optionally serve extra spicy ranch on the side for dipping your crust!