Place butter and sugar into a bowl and use a hand mixer or stand mixer to combine the ingredients together until smooth.
Add eggs 1 at a time and mix until combined.
Sift the flour and baking powder, and gradually add to the mixture, beating after each addition.
Add the milk and combine once more for 30 seconds. Make sure you're scraping down the sides of the bowl as you go.
Gently pour the cake batter over the top of the pears.
Use a spatula to smooth over the surface for an even covering.
Bake in the oven for 40-45 minutes, or until lightly browned on top and cooked through.