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Preheat the oven to 160°C and line 1-2 baking trays with baking paper
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Combine all the brown sugar, oats and flour in a large bowl.
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Melt the butter and vanilla together over a low heat.
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Combine the baking soda and boiling water in a small cup, then quickly pour straight into the butter mixture.
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Working quickly, pour the butter mix directly into the dry ingredients and stir to combine.
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Using a 2 tbsp cookie scoop, portion out the dough into tightly packed balls (or just roughly 2 tablespoons worth per cookie - you want them as even as possible for symmetrical ice cream sandwiches).
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Place them on baking trays, leaving room between them to spread (see photos)
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Bake for 12-14 minutes or until golden brown. They will be soft, so leave to cool on the trays.
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Store in an airtight container for up to 2 days before using in the ice cream sandwiches.