
This snack-cake situation comes together fast: butter and sugar creamed until pale and fluffy, eggs beaten in one at a time, and a generous hit of vanilla running through both the cake and the frosting. The batter mixes up smooth and gets baked in a single square pan until the edges pull away and the top turns lightly golden, so you end up with a tender, even crumb without any fuss. Once it's cooled, a swoop of vanilla buttercream goes on thick, sweet, and spreadable, then the whole thing gets cut into nine perfect squares. It's the kind of straightforward, one-pan bake that works for a weeknight treat or a lunchbox surprise, and it holds up beautifully as a gluten free option without losing that soft, buttery texture people love in a classic vanilla cake.
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Preheat the oven to 350°F (175°C). Grease an 8x8-inch baking pan with butter or nonstick spray, then line the bottom with a square of parchment paper.
In a large mixing bowl, beat the softened butter and granulated sugar together with a hand mixer on medium-high speed until pale and fluffy, about 3 minutes.
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