Oatmeal Cream Cheese Butterscotch Bars

INGREDIENTS

• 1 (14-ounce) can sweetened condensed milk
• 1 1/2 cups old fashioned rolled oats
• 1 (8-ounce) package cream cheese, at room temperature
• 1 teaspoon vanilla extract
• 2 sticks unsalted butter, at room temperature, cut into pea-sized pieces, plus more for pan
• 1 lemon, zested and juiced
• 2 cups all-purpose flour
• 3/4 cup firmly packed brown sugar
• 1 (11-ounce) bag butterscotch chips
• 1 teaspoon ground cinnamon