01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - Toss cauliflower florets with olive oil, kosher salt, and freshly ground black pepper in a large bowl. Arrange florets in an even layer on the prepared baking sheet.
03 - Roast in the oven for 25 to 30 minutes, flipping halfway through, until the florets are golden and tender.
04 - While cauliflower roasts, melt butter in a skillet over medium heat. Add panko breadcrumbs and cook, stirring frequently, until golden brown, about 3 to 4 minutes.
05 - Remove skillet from heat. Stir in lemon zest, minced garlic, parsley, chives, kosher salt, and black pepper until well combined.
06 - Transfer roasted cauliflower to a serving platter. Drizzle with lemon juice, top generously with lemon herb crunch, and garnish with additional parsley if desired. Serve warm.