Amazing No Cook Spinach Artichoke Dip

1 sweet onion, cut into quarters

8 cloves garlic, or more to taste

1 (14 ounce) can artichoke hearts, drained and chopped

1 (10 ounce) package frozen chopped spinach, thawed and drained

1 (8 ounce) package shredded Parmesan cheese

1 (1.4 ounce) package dry vegetable soup mix (such as Knorr®)

1 (8 ounce) package reduced-fat cream cheese, softened

1 cup reduced-fat mayonnaise

1 (8 ounce) container reduced-fat sour cream

Blend onion and garlic in a food processor until finely chopped. Add artichoke hearts; process until chopped. Add spinach, Parmesan cheese, and vegetable soup mix; process until well incorporated. Transfer mixture to a nonmetallic bowl.

Blend cream cheese, mayonnaise, and sour cream in the food processor until smooth; stir into artichoke mixture.