Spinach Artichoke Dip

Name: Spinach Artichoke Dip
Ingredients: 1 bunch spinach, thick stems trimmed; Kosher salt; 1 tablespoon vegetable oil; 1 large shallot, finely chopped; 1 garlic clove, finely grated; Freshly ground black pepper; 4 ounces cream cheese; ½ cup sour cream; ½ cup mayonnaise; 1 10-oz. package frozen artichoke hearts, thawed, chopped; ¾ cup grated Parmesan; Crackers, chips, or toasted baguette (for serving)