How to Make It
Place bacon slices in a single layer on a sheet pan, and place in oven. Preheat oven to 400°F, and bake bacon until crisp, about 20 minutes. Remove bacon from pan, and cut into 1-inch pieces.
While bacon bakes, process avocado, mayonnaise, lemon juice, and 1/4 teaspoon of the salt in a food processor until smooth.
Place bread cubes and tomatoes on sheet pan; toss to coat in bacon drippings. Arrange in an even layer, and sprinkle with pepper and remaining 1/2 teaspoon salt. Bake at 400°F until bread is golden and toasted, about 10 minutes.
Add arugula and bacon to bread mixture, and toss to combine. Drizzle evenly with avocado mayo, and serve immediately.