Preheat your oven to 475°F. Lightly spray an 18 x 13 sheet pan with non-stick spray and line it with parchment paper.
In a large bowl, whisk together the flour, powdered milk, sugar, yeast, and salt. Add the warm water and vegetable oil, stirring with a wooden spoon until the dough comes together.
Spread the dough onto the prepared sheet pan with your fingertips, pressing it out evenly. If the dough feels too sticky to spread, let it rest for about 5 minutes and then try again.
Bake the crust for 8-10 minutes until it’s firm but not fully browned. Remove it from the oven and set aside.
In a frying pan, brown the Italian sausage and ground chuck, seasoning with salt and pepper. Cook the meat until it crumbles and turns brown. Drain any excess grease and set the meat aside.
In a saucepan, combine the tomato paste, water, olive oil, garlic, salt, pepper, oregano, basil, and rosemary. Simmer for about 10 minutes to allow the flavors to come together. Let the sauce cool before using it.
Spread the sauce evenly over the partially baked crust. Layer the cooked meat mixture over the sauce, followed by a generous sprinkle of shredded mozzarella cheese.
Return the pizza to the oven and bake for 8-10 minutes until the cheese melts and turns golden brown. Let the pizza rest for 5 minutes before slicing and serving.