Preheat oven to 425°F. Line a large baking sheet with parchment paper. Place broccoli in a steamer basket set in a large saucepan. Add water to just below the basket. Bring to boiling; reduce heat. Cover and steam until just fork tender, 5 to 7 minutes.,

Spread Parmesan in an even layer on the prepared baking sheet. Arrange broccoli florets in a single layer over cheese, leaving about an inch between pieces. Using the bottom of a glass, smash each broccoli floret until flattened. Sprinkle broccoli and cheese with Ranch Seasoning Mix; drizzle with 3 Tbsp. olive oil.,

Bake until golden brown, 20 to 25 minutes. Cool slightly. In a small bowl stir together Buttermilk Ranch Dressing and sriracha sauce (if using). Break broccoli mixture into pieces. Drizzle or serve with dressing.