Ingredients

1 1/2 Sticks unsalted butter, softened

1 1/4 c. plus 1 tbsp. sugar, divided

3 large eggs

2 tsp. pure vanilla extract

2 c. all-purpose flour

1 tsp. kosher salt

1/2 tsp. baking soda

1 1/2 tsp. cinnamon, divided

1 gal. vanilla ice cream, softened slightly

Preparation

Step 1Preheat oven to 350° and line a large rimmed baking sheet with parchment paper. In a large bowl using a hand mixer, beat butter and 1 1/4 cups sugar until fluffy. Add eggs and vanilla and beat until combined.Step 2 In a separate medium bowl, combine flour, salt, baking soda and 1 teaspoon cinnamon. Whisk to combine.Step 3Pour dry ingredients into wet ingredients and stir until just incorporated.Step 4Spread the batter into the prepared baking sheet and sprinkle with remaining cinnamon and sugar. Bake until set, 15 to 18 minutes.Step 5Let cool in pan completely, then cut the sheet cake in half crosswise to make two large rectangles.Step 6Spread vanilla ice cream onto one half, then place the second half on top to form one large ice cream sandwich.Step 7Freeze until the ice cream is firm, about 2 hours, then slice into squares. Serve immediately.