Preheat oven to 425°F. Line two baking sheets with aluminum foil or parchment paper.

Evenly divide Broccolini between prepared pans.

Drizzle with oil; sprinkle on garlic, salt, red pepper flakes, and black pepper.

Gently toss with your hands to distribute seasonings; spread out in a single layer.

Sprinkle with grated cheese; roast until golden brown, about 10-15 minutes.

Meanwhile, toast almonds in a dry, heavy skillet over medium heat, stirring constantly until golden, 1-2 minutes.

Remove from pan; allow to cool.

Sprinkle almonds over Broccolini; serve.