Preheat oven to 400 degrees F. Halve the avocados and pit. Brush inside and out with the lemon juice. Place on a parchment lined baking sheet. Set aside.

In a medium bowl add the bread, tomato, spinach, bacon, mayonnaise, salt and pepper. Toss lightly to combine. Fill each avocado half with ¼ of the bread mixture, packing lightly.

Bake for 10-13 minutes, or until the bread stuffing begins to brown. Remove and serve immediately.