Step 1: Season the Chicken
In a skillet over medium heat, warm olive oil, then add shredded chicken, chili powder, cumin, garlic powder, salt, black pepper, and lime juice.
Cook for 2-3 minutes, stirring until well coated and warmed through.
Step 2: Heat the Beans
In a saucepan, heat olive oil over medium heat.
Stir in refried beans, cumin, and garlic powder, cooking until warm and smooth (~2-3 minutes).
Step 3: Make the Guacamole
In a bowl, mash avocados with lime juice and salt.
Stir in red onion, cilantro, and jalapeño (if using).
Step 4: Assemble the Tostadas
Spread a layer of warm refried beans on each tostada shell.
Add shredded chicken, followed by guacamole.
Top with lettuce, tomatoes, cotija cheese, sour cream, and cilantro.
Step 5: Serve And Enjoy!
Serve immediately with hot sauce or salsa on the side.