Lightly grease two 12-hole non-stick mini muffin pans (2 tablespoon capacity) with cooking spray.
Place flour, polenta, paprika, carrot, corn, spinach and cheese in a large bowl.
Whisk yoghurt, oil, water and eggs in a large jug. Add to flour mixture. Stir until combined.
Spoon heaped tablespoons of mixture into prepared pans. Sprinkle with pepitas.
Bake in a 200 °C preheated oven for 15-18 minutes or until lightly golden and just firm to touch. Cool in pans for 5 minutes. Turn onto a clean tea towel or wire rack to cool. Serve warm or at room temperature.