Creating Ground Beef Tostadas is a straightforward process. Follow these simple steps to assemble this incredible dish:

1. Cook the Beef: In a large skillet, heat the olive oil over medium heat. Add the chopped onion and sauté until softened, about 3-4 minutes. Add the minced garlic and cook for an additional minute.

2. Season the Meat: Add the ground beef to the skillet. Cook until browned, breaking it apart with a spatula, approximately 5-7 minutes. Stir in taco seasoning and cook for another 1-2 minutes until well combined.

3. Prepare Tostada Shells: While the beef is cooking, place the tostada shells on a baking sheet. If you prefer them warm and slightly crispy, bake them in the oven at 350°F (175°C) for about 5-7 minutes.

4. Assemble Tostadas: Once the tostada shells are ready, start assembling by spooning a layer of the cooked ground beef onto each shell. Top with shredded lettuce, diced tomatoes, and shredded cheese.

5. Finish with Toppings: Add sliced avocado, a dollop of sour cream, and your desired amount of salsa. Garnish with fresh cilantro if using.