Peel the pears, remove the seeds, and cut half into slices and half into small cubes. In a large bowl, beat eggs and sugar with an electric mixer until light and fluffy. Mix in the vegetable oil and yogurt until smooth.
Sift in the flour, baking powder, and cocoa powder and mix until combined.
Gently fold in the small pear cubes. Line a 24cm cake pan with parchment paper and pour in the batter.
Arrange the pear slices in a circular pattern on top. Bake at 350°F (180°C) for about 45 minutes.
