Preheat your oven to 350°F (175°C).
Line a cupcake pan with parchment liners or lightly grease it.
In your blender, combine the dry ingredients: all-purpose flour, cocoa powder, sugar, baking soda, and salt. Blend on low for a few seconds to mix.
Add the hot water, canola oil, egg, and vanilla extract to the blender. Blend on high for about 30 seconds until smooth.
Pour the batter into the prepared cupcake pan, filling each liner about two-thirds full.
Bake in the preheated oven for 18-20 minutes, or until a toothpick comes out clean.
Allow the cupcakes to cool for about 5 minutes before transferring to a wire rack to cool completely.