Chicken Tostadas

Name: Chicken Tostadas
Ingredients: 4 tostadas (flat and crispy corn tortilla shells); 1 cup cooked chicken (the frozen chicken breast strips work well here too); 4 cups lettuce, from a bagged salad; 1 pint cherry tomatoes or 1 cup tomatoes, chopped; 1⁄2 cup ranch salad dressing (or your favorite dressing); 1⁄2 cup Mexican blend cheese, shredded; 1 avocado, peeled and cubed (optional); 1⁄2 cup red onions or 1⁄2 cup sweet onion, chopped; 1 cup refried beans (optional) or 1 cup black beans, drained (optional); 1⁄2 cup black olives (optional)