Strawberry-Avocado Taco Salad

4 ounces tortilla chips, broken
2 cups shredded lettuce
1 cup sour cream
2 avocados
1 tablespoon lemon juice
1/4 teaspoon salt
2 cups halved strawberries
1/2 cup shredded Cheddar cheese

Place tortilla chips on bottom of a large serving plate or on bottoms of individual serving bowls; sprinkle with shredded lettuce. Spoon sour cream over lettuce. Mash avocado with lemon juice and salt, and spoon over the top of the sour cream. Add strawberries; sprinkle shredded cheese over top.