Tortilla tapas

INGREDIENTS

• 3 tbsp olive oil
• 1 large onion , thinly sliced
• 3 medium-size potatoes , peeled and thinly sliced
• 2 garlic cloves , crushed
• 2 large red peppers , quartered, seeded and thinly sliced
• 6 large eggs , lightly beaten
• ½ tsp dried crushed chilli flakes
• handful flatleaf parsley , chopped