Receta Roasted Purple Sweet Potatoes and Brussel Sprouts

2 Medium sized Purple Sweet Potatoes 1 1/2 pounds Brussels sprouts (small sized sprouts) 2 small sweet onions 3 tablespoons good olive oil 1 Tbsp. Granulated Garlic 3/4 teaspoon kosher salt 1/2 teaspoon freshly ground black pepper Directions: Preheat oven to 425 degrees F.