Prepare chicken by dicing into bite sized pieces.
Add olive oil to a medium skillet and heat. Add chicken when oil starts to shimmer or is hot. Add seasoning for chicken (1 tsp garlic powder, 1 tsp chili powder, ½ tsp cumin, ¼ tsp salt, ¼ tsp ground pepper). Cook until chicken is done (160 F) or about 8minutes, stirring frequently.
Prepare sauce in a small bowl. Stir together mayonnaise, 1 cup of salsa, and cumin until well combined. Set aside.
Chop lettuce into small pieces. Chop avocado into small bite sized pieces.
To assemble: Place 2 taco shells on each plate. Fill each with chicken, about ¼ cup lettuce, 1 heaping Tbsp salsa, about 1 Tbsp avocado, cilantro and cheese.