The video shows a person preparing a cake batter in a clear glass bowl. The person starts by placing three sticks of butter in the bowl. Then, they use an electric mixer to beat the butter until it is creamy. After that, the person adds a cup of sugar and continues to mix until the sugar is fully incorporated. Next, they add a teaspoon of vanilla extract and mix it in. Finally, the person adds a cup of flour and mixes it until the batter is smooth and creamy.