In the bowl of a stand mixer, combine 2 1/2 cups bread flour, 1 teaspoon sugar, 1 package active dry yeast, and 1 teaspoon salt.
With the mixer running and using the dough hook, pour in 1 cup warm water and 2 tablespoons olive oil and mix until a dough ball forms; if not using a mixer, stir then knead by hand until smooth.
Turn the dough onto a lightly floured surface and knead briefly into a smooth, firm ball.
Grease a large bowl with a little oil, place the dough inside, cover with plastic wrap, and let rise in a warm spot until doubled, about 1 hour.
While the dough rises, make the enchilada sauce: whisk 1 cup stock or water with 2 tablespoons flour in a small saucepan until smooth.
Add 2 tablespoons chili powder, 1/2 teaspoon garlic powder, 1/2 teaspoon salt, 1/4 teaspoon cumin, 1/4 teaspoon oregano, and 1/4 teaspoon black pepper; whisk to combine.
Simmer the sauce over low heat, whisking occasionally, until thickened and reduced by about half, about 10–15 minutes; remove from heat and set aside.
Preheat the oven to 500°F (260°C). Grease and lightly flour a 12–14 inch pizza pan.
Shape the risen dough on the prepared pizza pan to form an even crust.
Spread a thick layer of the warm enchilada sauce over the dough, leaving a small border for the crust.
Evenly distribute 1 cup shredded chicken over the sauce, then sprinkle 1 cup shredded mozzarella and the optional 1/2 cup shredded pepper jack on top.
Add toppings as desired: sliced jalapeños, 1/4 cup diced onions, 1/2 cup sliced grape tomatoes (optional), and 1/4 cup black olives.
Bake the pizza at 500°F for 15–20 minutes, or until the crust is golden and the cheese is bubbly.
Remove from the oven and sprinkle 2 tablespoons chopped fresh cilantro over the pizza before slicing and serving.