Heat 1 Tablespoon of olive oil in a large skillet or pan over medium-high heat. Add the tortillas and cook about 2-3 minutes per side, just until the tortillas start to get crispy edges and darken a bit. Remove from heat and set aside.
Season the shrimp
In a large bowl, whisk together all of the shrimp seasoning ingredients (olive oil, cumin, chili powder, garlic powder, onion powder, oregano, salt and pepper). Add the shrimp and toss to fully coat the shrimp. Set aside and allow to marinate while you make the guacamole and pico de gallo.
Make the guacamole
In a large bowl, smash the avocado until creamy. Then mix in the garlic and cilantro until well combined. Set aside.
Make the pico de gallo
In a separate large bowl, mix together the diced tomatoes, shallots, cilantro, and lime juice until well combined. Set aside.
Cook the shrimp
Add the shrimp to the same skillet used to cook the tortillas, over medium-high heat. Cook for about 1-2 minutes on each side, just until the shrimp is cooked through.
Assemble the tostadas
Place a tortilla round on a plate. Top with some guacamole. Add a few pieces of the cooked and seasoned shrimp. Top with a little pico de gallo. Serve immediately.
Notes
Makes 6 shrimp tostadas.Storage: store leftovers in an airtight container in the refrigerator for up to 3 days.