I stumbled upon this recipe on Eat Better America. I didn't have everything they listed so I made up my own version. Mine is as follows.
1 pound boneless skinless chicken cut in pieces
1 large white onion chopped
3 Cloves garlic chopped
2 cups sour cream
3 tbsp green chili sauce
2 tsp cumin
2 tsp chili powder
3 tsp garlic powder
3 tsp Tapatio (or other favorite hot sauce)
2 cups salsa
8 crunchy tostada shells
2 cups shredded Monterrey jack cheese
Preheat oven to 350. Heat skillet over medium heat and coat with cooking spray. Add chicken and stir until no longer pink (about 5 minutes). Add chicken to a medium bowl. Wipe skillet and spray with cooking spray. Add in onions and cook until the color begins to fade. Add garlic and cook for one more minute. Add onions and garlic into bowl with chicken.
In small bowl combine sour cream chili sauce, hot sauce and seasonings. Stir to combine, taste for flavor, add more of something if you prefer a stronger flavor.
In bottom of baking dish spread about 1/4 cup salsa. Place tostada shell on top, then add 1/4 sour cream mixture followed by 1/4 chicken mixture. Top with cheese. Add a second tostada shell and repeat the process. When you reach the top place your final shell, with remaining sour cream mixture and cheese on top. Place dish in oven and cook uncovered for 30 minutes. If cheese browns too quickly cover with foil. Allow dish to cool, cut and then serve.
**In a pinch you can sub tortilla shells for the tostata shells. You could also use any variety of shredded cheese that you prefer.**
(Please note, the sour cream will separate some in cooking, this is normal. Do not panic. It should look that way. I promise!)