Preheat oven to 400 degrees. Toss asparagus, olive oil, and salt and pepper together in a baking dish. Roast for 15-20 minutes or until crisp tender.
Meanwhile, pulse the bread slices in a food processor until you've made breadcrumbs.
Melt butter in a medium saucepan over medium-high heat. Add the crumbs and stir until they are golden and crisp. Spread on a plate to cool.
Pulse, lemon zest, herbs, garlic, salt and pepper in food processor until they are the same consistency as the bread crumbs. Mix together with cooled crumbs.