Preheat the oven to 220°C (425°F).
Whisk the eggs with a fork or whisk until well combined.
Add the yogurt and olive oil, and mix well.
Add the cornmeal, gluten-free flour, buckwheat flour, salt and baking powder, and mix until combined.
Add the cheese and fold gently, so the pieces don't break apart.
Pour about 2 tablespoons of batter into each muffin cup.
Sprinkle sesame seeds on top, if using.
Bake in the preheated oven for 20-30 minutes, until golden and fully cooked through.
Remove from the oven and transfer to a plate or tray to cool.