Coarse kosher salt and freshly ground black pepper
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Instructions
Preheat the broiler. Spread out the asparagus spears in a single layer on a rimmed baking sheet lined with a nonstick silicone baking sheet. Drizzle with 1 tablespoon of oil and shake the pan to evenly coat the spears. Season with salt and pepper. Divide into 4 equal portions on the baking sheet. Set aside.
Heat the 1 tablespoon of remaining oil and 1 tablespoon of butter in a small skillet over medium high heat. Add the bread bits and season with salt and pepper. Cook until golden brown, 2 to 3 minutes. Set aside and keep warm.
Broil until the spears are just tender, 4 minutes for thin and up to 10 minutes for thick asparagus. In the last few minutes of cooking, top each individual bundle with a slice of mozzarella. Return to the broiler and cook until melted and bubbly, about 2 minutes, depending on the strength of your broiler. Transfer the bundles to warm plates. Sprinkle over toasted bread and red pepper flakes. Serve immediately.