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Let the turkey rest. Strain the liquid from the crock pot. Make gravy while the turkey rests. Crisp the skin under the broiler. Serve the turkey breast with the gravy.
Test the temperature of the turkey using a meat thermometer inserted into the thickest part of the breast. Once it's reached 165 °F (74 °C), it's safe to eat. Insert a sturdy wooden spoon into the turkey cavity. Hold several paper towels in your other hand and press the paper towels against the end of the turkey while you lift up with the handle of the spoon. Carefully lift the whole turkey out of the crock pot and set it on your carving board. Let the turkey rest for 20 minutes.  Allowing the turkey to rest will help the juices redistribute within the turkey breast. This will keep it from drying out. You could also use 2 large meat forks to hold and lift the turkey breast out of the crock pot. Set a large measuring jug or cup into your sink. Place a mesh strainer over the measuring jug. Put on oven mitts and hold the crock pot. Pour the liquid from the bottom of the crock pot through the strainer and into the measuring jug. Remove the mesh strainer and discard the vegetables. You should have about 2 cups (470 mL) of liquid that you'll use for the gravy. If you don't have enough liquid, add chicken broth or water to get 2 cups (470 mL). Melt 4 tablespoons (57 g) of butter in a medium-sized saucepan over medium heat. Stir in 1/4 cup (31 g) of flour and cook it for 1 minute. Slowly pour in 1⁄2 cup (120 mL) of your turkey liquid and whisk constantly to prevent lumps. Keep adding more of the liquid as you whisk. The gravy should thicken as it cooks. Taste the gravy and season it with salt and pepper to taste.  If you like a thick gravy, cook it longer or use less of the turkey liquid. For a gravy that's easy to pour, you'll probably want to use all 2 cups (470 mL) of turkey liquid. If you have lumps in the gravy, you can use an immersion blender to quickly blend the gravy until it's smooth. Turn the broiler on to high and ensure that your rack is low enough to allow the turkey to fit in the oven. If you can, try to place the turkey about 12 inches (30 cm) below the broiler. Set the cooked turkey on a sturdy baking sheet or dish and set it on the rack. Broil the turkey for 3 to 5 minutes. The skin should turn crispy and golden brown. Avoid walking away from the broiler while the turkey is crisping. If it browns quickly, you'll need to pull it out of the oven to keep it from burning. As soon as the turkey skin is golden, carefully remove it from under the broiler and carve it. Place the carved pieces on a warmed serving platter and serve it right away. Set the gravy out on the side so guests can serve themselves. If you choose to keep the turkey warm in the oven for a while before serving it, the turkey may become dry or even tough. If you must keep it warm before serving it, wrap it well and broil it just before you do serve it.