Add the 2 (15-ounce) cans drained southwest-style corn, 1 (10-ounce) can drained fire-roasted diced tomatoes, 1 (4-ounce) can drained diced jalapeños, 2 cups shredded sharp cheddar cheese, and ¼ cup sliced green onions to a large bowl.
In a small bowl, whisk together the 1 cup mayonnaise, 1 cup sour cream, 1 teaspoon salt, 1 teaspoon garlic powder, 1 teaspoon onion powder, 1 teaspoon dried parsley, ½ teaspoon pepper, and ¼ teaspoon chili powder until smooth.
Mix the dressing mixture in with the vegetables and stir well to mix everything together. Serve immediately or store in the fridge for a few hours to let the flavors blend.
Notes
Storage Instructions: Store this dip in the fridge in an airtight container for up to 5 days. I don't recommend freezing this dip. It's best served fresh.