Ingredients

• 1 egg
• 2 tablespoons all-purpose flour
• 2 teaspoons white sugar
• 1 1/2 teaspoons milk
• 1 teaspoon chopped rhubarb
• 1/3 teaspoon ground cinnamon

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Instructions

1. Mix egg, flour, sugar, milk, rhubarb, and cinnamon together in a large microwave-safe mug.
2. Cook on high until cake rises above the top of the mug, about 3 minutes. Let cool for 1 minute before serving.