Heat frying pan to medium/high heat. Add bacon and cook until crispy. Add onions and sauté until fragrant.
Stir in spinach and toss. Cover with tight fitting lid and cook until wilted. Remove lid and cook until water evaporates.
Remove from heat and set aside to cool completely.
Using 1½ inch cookie cutter, cut hole in the center of four bread slices.
In non stick pan, melt ½ tbsp (7 mL) butter and ½ tsp (2 mL) olive oil and place a slice of bread with hole in pan. Crack egg into hole and cook for 1 minute or until bread is toasted and egg is firm enough to flip.
Loosen and gently flip to cook other side of egg. On other side of pan, place a slice of bread with no hole to toast and top with spinach mixture and mozzarella cheese.
When egg is cooked and bread is toasted, flip onto the slice of bread with spinach to form sandwich. Continue cooking until cheese is melted. Egg can be cooked until your desired doneness.
4 servings