Preheat your oven to 350°F (175°C).
Grease a 9-inch round cake pan and set it aside.
In a bowl, whisk together the flour, baking powder, ground cinnamon, and salt.
Set this mixture aside.
In another bowl, cream the softened butter and sugar until light and fluffy.
Add the eggs, one at a time, beating well after each addition.
Mix in the vanilla extract.
Gradually fold in the flour mixture, alternating with the milk, and mix until just combined.
Pour the batter into the prepared cake pan.
Arrange the sliced pears on top of the batter in a circular pattern.
Sprinkle the brown sugar evenly over the top.
Bake for 40-45 minutes until a toothpick inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.