Brie, courgette & red pepper muffins

Name: Brie, courgette & red pepper muffins
Prep time: 25 min
Cook time: 35 min
Total time: 1 h
Cuisine: Mediterranean
Ingredients: knob of butter; 2 small or 1 large courgette cut into small cubes; 250g self-raising flour; 1 tsp baking powder; 1 tbsp fresh oregano leaves or 1 tsp dried; 3 eggs lightly beaten; 100ml milk; 5 tbsp sunflower oil; 2 red peppers skinned (see tip, below) and cut into bite-sized pieces; 85g cheddar grated; 100g brie or camembert (check packaging for a vegetarian-friendly brand)