Hide Step Photos. Preheat oven to 375-degrees. Melt chocolate and butter in a small saucepan, cool 10 minutes. In the meantime, in a separate bowl, whisk eggs and sugar together. Add vanilla and flour and whisk until flour is well mixed in. When chocolate has cooled stir in egg mixture.
Instructions. Preheat the oven to 350 degrees F. Spray a 13x9-inch pan with nonstick spray. In a large bowl, use an electric mixer to combine the cake mix, 1 egg and 1 stick of melted butter until well combined. Pat the mixture into the bottom of the prepared pan.
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royal thai butter cake recipe