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Preheat the oven to 300*F and make sure the rack is in the middle of the oven.
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Grease an 8" cake tin and line with parchment paper on the bottom and the sides.
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Combine the maple syrup, treacle, light brown sugar, and butter in a small sauce pan. Place the sauce pan over low heat, stirring frequently until everything melts down and comes together. You do NOT want this to simmer or boil. There will still be some undissolved sugar--that's fine!
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While your liquid ingredients are warming, get your dry ingredients together. Put your oats in a large bowl. Break them up a little with your hands. I break up the oats so that there are still some whole oats and some coarsely broken smaller bits. If you prefer you could blitz them up in the food processor with maybe 2 or 3 pulses.Then add the flour, baking soda, salt, ginger, cinnamon, nutmeg and cloves. Whisk it all together.
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In a small bowl or measure cup whisk the egg and milk together.
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Once your treacle mixture has come together, make a well in your dry ingredients and pour the treacle mixture into it. With a wooden spoon, mix it all together. Then add the milk mixture. Stir until all the milk mixture has incorporated. It will look like it's not going to come together, but keep going. It will.
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Once it has all come together and looks like a cohesive batter pour it into your prepared cake tin.
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Place in the oven and bake until a cake tester inserted in the middle of the cake comes out clean (55mins to 1hr. 5mins).
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Let the cake cool in the pan, on a cooling rack, for 20 minutes.
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Remove from the pan and allow to cool completely before slicing.
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Serve with softly whipped cream, ice cream or simply on its own.