Preheat the oven to 400°F.
Arrange bacon slices on a sheet pan and bake until crispy. Remove the bacon and set aside, leaving the bacon drippings on the pan.
Add bread cubes and cherry tomatoes to the sheet pan. Toss them with the bacon drippings, salt, and black pepper until evenly coated.
Bake until the bread becomes crisp and golden and the tomatoes soften and roast.
While the bread and tomatoes cook, prepare the avocado mayo by blending avocado, mayonnaise, lemon juice, garlic, salt, and pepper until smooth and creamy.
Add arugula to a large bowl and combine with the roasted bread cubes and tomatoes.
Crumble the crispy bacon over the salad.
Drizzle with avocado mayo and toss gently before serving.