Heat a large non-stick frying pan over a high heat, spray with oil. Cook the bacon for 2 minutes each side, or until golden and crisp.
Meanwhile, toast the bread until golden. Place the avocado in a small bowl and roughly mash.
Spread avocado over 2 slices of the toast, spread mayonnaise over remaining 2 slices of toast.
Top avocado with 2 bacon slices, some tomato and 2 baby cos leaves. Top with other slice toast.
Serve immediately.
Serving Size 2
Servings 2