Warm the butter, golden syrup, black treacle, sugar, cinnamon & ginger in a small saucepan, on medium heat until dissolved & melted. (** Tip for using syrup, treacle or molasses – spray oil on a measuring spoon first & it will slip off easier. See Photo 1 from using Frylight cooking spray.) Mix thoroughly, remove from the heat & leave to the side to cool. Meanwhile prepare the mini bundt cases/tin. I recommend Frylight Onecal spray (butter, olive oil or rapeseed oil all work for me), on the silicone or metal bundts. You can also use homemade lining paste/cake goop on metal mini bundts, but spraying is much quicker for bundts. Alternatively grease with butter and flour. (**Top Tip – for mini silicone bundt cases, put in a cupcake tray/sheet as they hold their shape better, and it is easier to manage too. Heat the oven to 180°c/160°c Fan Oven/350°f/Gas Mark 4.
Add the egg to a medium bowl & whisk lightly to activate the protein & help provide structure for the cake. Then whisk in the milk & bicarbonate of soda (baking soda), till all incorporated. Followed by the slightly cooled syrup mixture, stirring continually until combined.
Sieve the flour (& baking powder if using Plain/All Purpose Flour), over the mixture & beat until combined. Use a hand/stand-mixer & there will be less lumps, but a few is fine, in this thin cake batter.
Spoon the cake batter evenly into the prepared mini bundt cases/tin. You are looking for about ¾ full. Finally tap the tin on the counter/worktop a few times to expel any trapped air.
Bake in the centre of the oven, for about 15 - 20 minutes, until set, a deep golden colour, & a wooden cocktail stick comes out clean of crumbs. Mine were fully baked after 18 minutes.
Leave the mini bundts in the tin/cases, and place on a cooling rack for about 10 minutes. Remove the silicone bundt cases from the cupcake tray (if using), and leave to cool down completely before trying to remove. See my video on me doing this. Top Tip: If you over-filled your bundts (mini or regular size), that may be making sitting flat difficult, place the cakes right way up when cooling. Doing this whilst still hot, and with gravity and the weight of the cake, it will settle a bit and become flatter. Saves you trying to trim them.