Preheat oven to 325 degrees F.
Line an 8-inch square cake pan with parchment or baking paper. Grease the paper with butter and dust lightly with flour.
In a saucepan, melt the molasses, butter, corn syrup, brown sugar, and almond milk over a low heat. Remove from heat and let cool.
Sift together the oat bran, flour, spices, and baking soda in a large mixing bowl.
Pour in the butter mixture and beat. Add one egg at a time and continue to beat until you get a smooth paste.
Pour the mixture into the square cake pan and bake for 35-40 minutes. The cake is done when a toothpick inserted into the center comes out clean.
Allow the cake to cool in the pan for 5 minutes.
Turn the cake out of the pan, remove the paper, and cool on a wire rack right side up.
When completely cool, spread chocolate frosting on the top, leaving the sides bare.