Preheat oven to 350°. Spread almonds in a single layer on a rimmed baking pan. Roast almonds until golden beneath the skin and fragrant, about 10 minutes. Cool to room temperature.
In a food processor, finely chop garlic. Add almonds and whirl until coarsely chopped. Add parsley, olive oil, salt, and red chile flakes and whirl until parsley is finely chopped. Add parmesan cheese and pulse to combine.
Make ahead: Up to 1 day, chilled.