
Preheat the oven to 170°C (350°F). In a medium bowl, whisk together the all-purpose flour, salt, ground cinnamon, and baking powder until evenly combined.



In a blender, combine the vegetable oil, mayonnaise, brown sugar, egg, and vanilla. Blend until the mixture is smooth, thick, and creamy.



Pour the wet mixture into the bowl of dry ingredients and stir until no dry flour remains and the batter is smooth. Lightly grease a mini Bundt pan, then pour in the batter and spread it evenly.


If using a flexible silicone Bundt pan, place it on a sturdy metal baking tray before transferring it to the oven for better support.



Bake for 30 to 35 minutes, or until a toothpick inserted into the center comes out clean. While the cake bakes, make the crumb topping by mixing the flour, honey, cinnamon, and oil in a small bowl until coarse crumbs form.



Let the cake cool in the pan for a few minutes, then carefully loosen the edges and invert it onto a plate. Sprinkle the crumb topping over the cake, then return it to the oven at high heat for 2 to 3 minutes to lightly set the topping. Cool slightly before serving.


