To Make the Cake:
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Preheat your oven to 350°F (175°C). Grease and lightly flour a 9×13-inch baking pan, or line muffin tins for cupcakes.
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In a large mixing bowl, whisk together the dry strawberry cake mix and strawberry gelatin powder.
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Add the eggs, vegetable oil, milk, mashed strawberries, and vanilla extract. Using an electric mixer on medium speed, beat for about 2 minutes, until the batter is smooth and well-combined.
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Pour the batter into your prepared pan and spread it evenly. Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
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Allow the cake to cool completely in the pan set on a wire rack before applying the glaze.
To Make the Glaze:
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In a medium bowl, combine the sifted powdered sugar, 2 tablespoons of strawberry puree, and the vanilla extract. Whisk until the glaze is completely smooth. If it seems too thick, add more puree, one teaspoon at a time, until it reaches a pourable consistency.