Preheat the oven: Begin by preheating your oven to 400°F (or according to the instructions provided with your puff pastry).
Prepare the crust: On a greased sheet pan, roll out the thawed puff pastry, taking care to create a border resembling a traditional pizza crust. Use a fork to pierce the pastry to prevent it from ballooning.
Par-bake the crust: Place the sheet pan in the oven and par-bake the puff pastry for 8 minutes, or until slightly golden.
Cook the beef: While the crust is baking, heat a skillet over medium heat. Add 1 lb ground beef and ¼ cup chopped onion, cooking until the meat is browned. Be sure to drain any excess fat to keep the dish from becoming greasy.
Add seasoning: Stir in 1 packet taco seasoning and ¼ cup water into the skillet. Allow the mixture to simmer for 5 minutes, letting the flavors meld together.
Layer the pizza: Once the puff pastry is ready, remove it from the oven. Spread 16 oz of warm refried beans evenly over the baked pastry. Layer the seasoned taco beef mixture on top, followed by 3 cups of shredded cheddar cheese.
Final bake: Return the sheet pan to the oven and bake for an additional 5-7 minutes, or until the cheese is cheesy and bubbly.
Add toppings: After removing the pizza from the oven, top it with 1 ½ cups chopped lettuce, 1 cup sliced black olives, 1 cup diced Roma tomatoes, and 1 cup chopped green onions.
Serve: Slice the taco pizza, serve warm, and enjoy this festive delight!