Spinach dip (without the mix) - chinese grandma

Ingredients

• 1 1/2 cups Greek yogurt (or sour cream)
• 3/4 cup mayonnaise
• 1 1/2 teaspoon onion powder
• 1 teaspoon paprika
• 1/4 teaspoon garlic powder
• 1 1/2 teaspoon kosher salt
• 3/4 teaspoon black pepper
• 2 teaspoons Worcestershire sauce
• 1/2 cup chopped scallions
• 1 8-ounce can water chestnuts, drained and chopped finely
• 1 16-ounce package frozen chopped spinach, thawed and squeezed of excess moisture