1. Combine first 4 ingredients in a bowl, stirring well.
2. Preheat oven to 400°. Arrange pancetta in a single layer on a baking sheet coated with cooking spray. Bake at 400° for 8 minutes or until crisp. Drain on paper towels.
3. Spread mayonnaise mixture evenly over bread slices. Top each of 4 bread slices with 2 pancetta slices, 4 tomato slices, and 1/4 cup arugula. Top sandwiches with remaining 4 bread slices.
MyRecipes is working with Let's Move!, the Partnership for a Healthier America, and USDA's MyPlate to give anyone looking for healthier options access to a trove of recipes that will help them create healthy, tasty plates. For more information about creating a healthy plate, visit www.choosemyplate.gov.