Preheat the oven to 350°F. Lightly grease a 9x13-inch baking dish with baking spray.
In a large bowl, beat sugar, butter, and oil until light, 2-3 minutes.
2 cups (400g) granulated sugar, 1/2 cup salted butter, 1/2 cup oil
Add eggs, lemon juice, and vanilla extract, mixing again and scraping the sides of the bowl as needed.
2 large eggs, 1 Tablespoon fresh lemon juice, 1 teaspoon vanilla extract
In a separate bowl, whisk flour, gelatin, baking powder, baking soda, and salt. Add half of the flour mixture at a time alternately with buttermilk.
2 1/2 cups (300g) cake flour, 2 Tablespoons powdered strawberry gelatin mix, 2 teaspoons baking powder, 1/2 teaspoon baking soda, 1/2 teaspoon salt, 1 cup buttermilk
Stir diced strawberries into cake batter. Pour into the prepared baking dish.
3/4 cup finely diced strawberries
Bake for 30-40 minutes. Cool completely.
Beat cream cheese and diced strawberries in a bowl using an electric mixer.
1 (8-ounce) package full-fat cream cheese, 1/2 cup finely diced strawberries
In a separate bowl, whip heavy cream until soft peaks form. Add powdered sugar and vanilla; beat again until stiff peaks form.
1 1/2 cups heavy cream, 3/4 cup powdered sugar, 1 teaspoon pure vanilla extract
Fold half of the strawberry cream cheese mixture into whipped cream until combined. Frost cake with whipped cream frosting, then decorate with additional strawberries.
Additional strawberries