01 - Combine diced chicken with olive oil, cumin, chili powder, smoked paprika, garlic powder, salt, and black pepper in a medium bowl. Toss until evenly coated.
02 - Heat a large skillet over medium-high heat. Add seasoned chicken and cook for 6-8 minutes, stirring occasionally, until golden brown and cooked through. Transfer to a plate and cover to keep warm.
03 - In the same skillet, add red and yellow bell peppers, red onion, and zucchini. Sauté for 4-5 minutes until just tender but still vibrant. Remove from heat.
04 - Mash avocados with lime juice and salt in a bowl. Stir in diced tomato, chopped red onion, and cilantro. Adjust seasoning to taste.
05 - Place tostada shells on a serving surface. Layer each with sautéed vegetables, followed by spiced chicken.
06 - Spoon guacamole generously over each tostada. Top with shredded lettuce, crumbled cheese, fresh cilantro, and lime wedges. Serve immediately for optimal crispness.