Spray crockpot walls with cooking spray
Add chicken to crockpot
Mix all the spices in a small bowl and sprinkle on top of the chicken
Pour ½ of the jar of salsa on top of the chicken
Place lid on crockpot and cook chicken on low for 4-6 hours or high for 2-3 hours. (It should be very tender.)
Shred the chicken while adding in the cooking liquid as you desire
Pre-heat oven to 400 degrees and bake tortillas for 8 -10 minutes.
Assembly tostadas with desired toppings