Preheat the oven to 350F and grease your 10x15 jelly roll pan.
Prepare the cake mix according to its directions and spread into your prepared pan. Bake for about 18 minutes, or until it springs back when lightly touched in the center. A toothpick will come out without wet batter on it. Set aside to cool.
Make the frosting
To make the frosting beat the softened butter until fluffy in a large bowl. Slowly add the sugar, a cup at a time, along with the lemon juice and vanilla. Beat until smooth and silky. If your frosting seems too thin add a bit more sugar, and if it seems too thick, thin it down with more lemon juice.
Assemble the dot cakes
When the cake has cooled use your cookie cutter (in the same size as your cake cups) to cut out rounds of cake. Note: if you don't have a cookie cutter you can actually use the cups or ramekins themselves to cut out the circles of cake. They might be a bit rough around the edges but no one will see that.
Place a round of cake into each cup. Top with the frosting, and bring it right to the top. Smooth it out so that it is completely flat.
Place your sprinkles in a bowl and dip each cup headfirst down into the sprinkles so that they cover the whole surface.
The cakes will keep at room temperature for a day or two. They can be refrigerated for longer storage. Have fun!
Notes
If your cake rounds are too thin to fill your cups, layer 2, with a bit of frosting between them.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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