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Preheat the oven at 350-degree F.
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Melt the butter on low heat in a small saucepan and pour it into an 8 by 8 inches baking dish or casserole pan.
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Now, take a medium-sized mixing bowl, mix all the dry ingredients; all-purpose flour, wheat flour, sugar, brown sugar, baking powder, cinnamon, nutmeg, cardamom, and salt.
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Pour the milk, dark rum, and vanilla into the dry mixture. With the help of a fork, mix them until no flour particles are visible.
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Now gently sprinkle the mixture over the melted butter in the dish into an even layer. Do not stir the butter and the mixture.
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With the help of the back of a spoon, press the batter down into a smooth and even layer.
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In a medium bowl, mix light brown sugar, toffee bits, and pecans.
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Sprinkle the pecan mixture over the batter in the casserole. It might seem a lot, but it is the perfect quantity for a cobbler. Do not stir the topping in too.
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Now carefully, pour the boiling hot water over the pie. Cover the whole surface and do not stir. It will look like a wet mess but worth it.
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Carefully and gently place the dish in the preheated oven for 25 to 30 minutes until bubbling and golden.
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Finally, let it cool on a cooling rack for 15 to 20 minutes.
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Serve warm with a dollop of whipping cream over or on the side.
