Huevos rancheros

Name: Huevos rancheros
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: Mexican
Ingredients: 14.5 oz fire-roasted diced tomatoes (411g (1 can) eg Hunt's with garlic); 1/2 onion (large, or 1 small onion, roughly chopped); 1/4 cup cilantro (coriander, a small bunch, leaves only); 1 chipotle pepper in adobo (or 1 fresh chili, or more if you prefer hotter); 1/2 lime juice; 16oz refried beans (454g (1 can) eg Rosarita's traditional, vegetarian or no fat); 4 tortillas ( - I used 8in corn tortillas but larger/smaller and wheat also ok); 2 tbsp vegetable oil (approx); 2 eggs (or 4, as you prefer); 1 avocado; 1 oz cotija cheese (30g, approx - or feta or cheddar suggested)