Mug cake

• ¼ cup all-purpose flour
• ¼ cup white sugar
• 2 tablespoons unsweetened cocoa powder
• ⅛ teaspoon baking soda
• ⅛ teaspoon salt
• 3 tablespoons milk
• 2 tablespoons canola oil
• 1 tablespoon water
• ¼ teaspoon vanilla extract
• Mix everything together and bake in oven
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