1. Combine all ingredients except orange zest and cranberries in a large nonstick skillet. Mix gently to distribute oil and syrup evenly. Ingredients will look shiny.
2. Turn heat to medium. Cook for 5 minutes, stirring frequently. Turn down heat to medium-low and continue to cook for another 5 to 10 minutes, stirring constantly. When ready, granola will be toasted and lightly browned with a matte finish.
3. Turn down heat to low. Stir in orange zest and dried cranberries. Cook, stirring constantly, until fruit heats through and zest becomes fragrant, about 2 minutes.
4. Spread hot granola on baking sheet and cool. Stir occasionally to break up clumps. When cooled completely, store in airtight container.