Gather all your ingredients on the countertop.
In a large mixing bowl, add the 16 ounces of sour cream.
Next, sprinkle in 1 cup of freshly shredded cheddar cheese.
Add the drained 11 ounces of canned corn kernels to the mixture.
Add the 10 ounces of drained RoTel.
Sprinkle in 1 ounce of ranch seasoning.
Using a spatula or spoon, gently mix all the ingredients together until they are well combined.
Cover the bowl with plastic wrap and refrigerate for at least 30 minutes.
Transfer the Fiesta Ranch Dip to a serving dish and pair it with your favorite dippers.