Combine orange juice, honey, and brown sugar in a small saucepan. Cook over medium heat just until sugar dissolves, stirring constantly. Remove from heat; stir in oil and vanilla.
Pour honey mixture over oat mixture, stirring to coat. Spread mixture in a thin layer onto a foil-lined jelly-roll pan coated with cooking spray. Bake at 300° for 10 minutes; stir. Bake an additional 15 minutes or until golden brown. Spoon granola into a bowl; stir in raisins. Let cool completely. Store in an airtight container.
Note: Store completely cooled granola in an airtight container at room temperature for up to 2 weeks.
Nutrition note: Old-Fashioned vs. Instant Oats Old-fashioned rolled oats is what most of us know as oatmeal. It's made from whole groats that have been steamed and flattened by large rollers. They cook in about 5 minutes. Instant oats are regular rolled oats that have been flattened even more, then cooked and dried. Instant oats are not the same as the sugary pulverized oats in individual packets.