Amazing No Cook Spinach Artichoke Dip

Ingredients (9)

• + 1 sweet onion, cut into quarters add to pantry
• + 8 cloves garlic, or more to taste add to pantry
• + 1 (14 ounce) can artichoke hearts, drained and chopped add to pantry
• + 1 (10 ounce) package frozen chopped spinach, thawed and drained add to pantry
• + 1 (8 ounce) package shredded Parmesan cheese add to pantry
• + 1 (1.4 ounce) package dry vegetable soup mix (such as Knorr®) add to pantry
• + 1 (8 ounce) package reduced-fat cream cheese, softened add to pantry
• ✓ 1 cup reduced-fat mayonnaise
• + 1 (8 ounce) container reduced-fat sour cream add to pantry