In a large bowl, add the mayonnaise, sour cream, onion powder, garlic powder, paprika, Worcestershire sauce, lemon juice, salt, and pepper. Whisk to combine well.
3/4 cup mayonnaise, 1 1/2 cups sour cream, 1 1/2 teaspoon onion powder, 1/2 teaspoon garlic powder, 1 teaspoon paprika, 2 teaspoons Worcestershire sauce, 1 teaspoon fresh lemon juice, 1 1/2 teaspoon kosher salt, 1/2 teaspoon fresh ground black pepper
Add the green onions, water chestnuts, carrots, and spinach to the bowl. Stir to combine thoroughly. Cover and refrigerate at least 2 hours before serving to allow the flavors to combine.
3 green onions, finely diced, 1 8- ounce can sliced water chestnuts, 1/2 cup carrots, 2 10- ounce packages frozen chopped spinach