Preheat the oven to 170°C. Line a 8 x 8 inch tin with non-stick baking paper.
Place the flour, spread, eggs, cocoa, sweetener and baking powder into a mixing bowl. Mix with a wooden spoon until thick and fully combined.
Scrape the mixture into the lined tin and sprinkle over the chocolate chips and half the mini eggs. Place in the oven for 15 minutes until slightly risen and set.
Remove from the oven and sprinkle over the remaining mini egg pieces pressing lightly into the surface of the brownies. Leave to cool in the tin for a few minutes and then transfer to a wire rack. Cut into 16 squares and serve.