In an electric mixer or large mixing bowl, mix together the peas, Cheddar, jalapenos, 3 tablespoons of the reserved jalapeno juice, butter, garlic powder and onion until blended. Season with salt and pepper. Heat the dip in a medium slow cooker and serve it warm with corn chips.
Cook’s Note
If you don't have a slow cooker, you can spread the dip into an 8-by-10-inch baking dish and warm it in the oven at 375 degrees F for 7 to 8 minutes before serving.