Preheat Your Oven: First things first, get your oven preheating to 200°C (180°C fan). If you're using a pizza stone, place it in the oven now to heat up.

Cook the Beef Filling: Heat the olive oil in a large frying pan over a medium-high heat. Add the finely chopped onion and cook for 3-4 minutes until softened. Add the minced garlic and cook for another minute until fragrant.

Brown the Mince: Add the beef mince to the pan. Break it up with a wooden spoon and cook for 5-7 minutes, until it's browned all over. Make sure to drain off any excess fat from the pan.

Season the Beef: Stir in the taco seasoning and cook for another minute to toast the spices. This small step really brings out their aroma. Remove from the heat and set aside.

Prepare the Base: In a small bowl, mix the refried beans and the salsa together. Spread this mixture evenly over your pizza base, leaving a small border around the edge. What works best for me is using the back of a spoon to get a nice, even layer.

Assemble the Pizza: Sprinkle about half of the grated cheese over the bean sauce. This creates a barrier to stop the base from becoming soggy. Top with the cooked beef mixture, then sprinkle the remaining cheese over the top.

Bake to Perfection: Place the pizza directly onto the middle rack of your preheated oven (or on your hot pizza stone). Bake for 15-18 minutes, or until the crust is golden brown and the cheese is completely melted and bubbling.

Add the Fresh Toppings: Once the pizza is cooked, remove it from the oven. Let it cool for a minute or two before topping with the shredded lettuce, diced tomatoes, and crushed tortilla chips. Drizzle with soured cream, slice, and serve immediately.