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Line a 20cm square brownie tin with baking parchment. Tip all the ingredients, except the mini chocolate eggs, into a saucepan set over a low heat. Stir gently until all of the sugar has melted. Turn up the heat and simmer for 10-15 mins, scraping the bottom of the pan regularly until the mixture reaches 115C on a sugar thermometer. If you don't have a sugar thermometer, drop a teaspoon of mixture into a small bowl of cold water – if it's ready, it will form a soft ball that can be easily flattened.
Remove the fudge mixture from the heat and leave to cool for 5 mins. Use a wooden spoon to beat the mixture for another 5 mins.
Roughly chop 100g of the mini chocolate eggs and tip these into the fudge mixture, then stir until evenly combined. Tip the fudge mixture into the prepared tin, smoothing the surface and pushing it into the corners using a rubber spatula. Scatter over the remaining mini chocolate eggs, then leave at room temperature until completely firm and set. Turn out onto a chopping board and cut into 20 squares before serving.