Vegetarian Breakfast Tostadas

Name: Vegetarian Breakfast Tostadas
Prep time: 5 min
Cook time: 15 min
Total time: 20 min
Cuisine: American, Mexican, Latin American, TexMex
Ingredients: 4 mini flour tortillas; 4 Tablespoons refried beans; 1 Tablespoon oil; 2 cloves garlic, (minced); 3 large handfuls fresh spinach; 4 eggs; 2 medium tomatoes, (sliced); 1/4 teaspoon salt; 1/4 teaspoon black pepper; 55 g (~ 2 oz) feta cheese, roughly crumbled; 1 medium avocado, (sliced)