Preheat oven to 350℉. In a small bowl combine the sour cream, lime zest, and lime juice, set aside.
Place tostada shells on a large baking sheet. Spread refried beans evenly over shells. Bake 5 minutes or until beans are warm and tostada shells are golden.
Meanwhile, heat a skillet and spray with nonstick cooking spray. Fry egg as desired.
Top warm tostadas evenly with spinach, fried eggs, salsa, cheese, sour cream mixture, cilantro, and salt & pepper.
Notes
Weight Watchers Points=4 per serving
Recipe by Not Just Sunday Dinner at https://notjustsundaydinner.com/healthy-huevos-rancheros/