Preheat your oven to 350°F (175°C). Grease and flour a 9x13 inch baking pan.

In a large bowl, combine the cake mix, eggs, vegetable oil, and water. Mix until well blended.

In another bowl, combine the brown sugar and cinnamon.

Pour half of the cake batter into the prepared pan, then sprinkle with half of the strawberry pieces and half of the brown sugar mixture.

Pour the remaining batter on top, and add the rest of the strawberries and brown sugar mixture on top.

Use a knife to swirl the batter and toppings together slightly.

Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted into the center comes out clean.

Allow the cake to cool completely.

In a small bowl, whisk together powdered sugar, milk, and vanilla extract to create a glaze.

Drizzle over the cooled cake before serving.