Egyptian eggah with cheese & zucchini

Ingredients

• 2 small onions (minced)
• 2 medium zucchini (peeled into ribbons)
• 3 medium tomatoes (deseeded and diced)
• 1 handful parsley (chopped)
• 1 handful coriander (chopped)
• 1 tablespoon vegetable oil
• 1 tablespoon butter
• 6 large eggs
• 1 tablespoon all-purpose flour
• 1/4 teaspoon baking powder
• 6 tablespoons Frico Gouda cheese (wedge) (shredded)
• salt and pepper (to taste)