Drain, rinse, and spread chickpeas on paper towels. Let air-dry for 1 hour, then pat dry.

Preheat oven to 400 degrees.

Pour oil onto a rimmed baking sheet and preheat in oven for 10 minutes. Carefully remove pan from oven and add chickpeas. Toss to coat. Roast, stirring a few times, until golden and crispy, 30 to 35 minutes. Let cool to room temperature, then toss in a bowl with garam masala, 1/2 teaspoon salt, and a pinch of pepper. Chickpeas can be stored in an airtight container at room temperature up to 5 days.