Divide among 4 plates, topping each with breadcrumbs and lemon zest.
Place butter and olive oil in a sauté pan with the garlic. Place over medium-high heat and bloom the garlic until golden brown.
Remove garlic and add breadcrumbs. Toss frequently until golden. Season with chili flakes, lemon zest, and salt. Transfer to a paper towel-lined plate. Once cool, store in a sealed container at room temperature.