Rosemary Sweet Potatoes

2 pounds red potatoes – large cubes
3 tablespoons olive oil 
3 tablespoons chopped rosemary 
sea salt 
ground pepper   

Preheat oven to 425° F. Toss potatoes, olive oil, and rosemary and place them on a single layer on a baking sheet.   Season with salt and pepper.  Roast for 15 minutes.  Turn potatoes and roast for another 15 minutes.