In a large skillet over medium heat, add the ground chuck. Once browned, drain excess fat. Stir in the masa harina, chili powder, onion powder, garlic powder, seasoning salt, paprika, ground cumin, garlic salt, sugar, dried minced onion, and beef bouillon powder. Cook for an additional 5 minutes to allow the flavors to meld. Remove from heat and set aside.
In the same skillet, heat about 1/4 inch of vegetable oil over medium-high heat. Once hot, add a tortilla and fry until golden brown and crispy, about 2-3 minutes on each side. Remove and place on a paper towel-lined plate to absorb excess oil. Repeat with remaining tortillas.
On a serving plate, spread a layer of refried beans on one tortilla. Next, add a generous portion of the seasoned taco meat. Sprinkle with a handful of shredded Mexican cheese blend. Top with a second tortilla and repeat the layering process, finishing with a tortilla on top.
Preheat your oven to 350°F (175°C). Place the assembled Mexican pizzas on a baking sheet and bake for about 10-15 minutes, or until the cheese is melted and bubbly.
Once out of the oven, drizzle the top with Taco Bell sauce, and sprinkle with chopped tomatoes. Slice into wedges and serve immediately.