Lemon Cream Cookie Bars

Ingredients (5)

• + 1 (17.5 ounce) pouch dry sugar cookie mix (such as Betty Crocker®) add to pantry
• + 1 stick butter, softened add to pantry
• + 1 egg add to pantry
• + 1 (14 ounce) can fat-free sweetened condensed milk add to pantry
• ✓ 2 lemons, zested and juiced