Smashed Chickpea and Chicken Sandwich

• 0.33 cup tin chickpeas, drained and rinsed
• 25 g feta cheese
• 1 tbsp Greek yoghurt
• 2 tbsp red onion, diced
• 1 tsp extra virgin olive oil
• 1 tsp paprika (or any other seasoning)
• 2 slices of wholegrain bread
• 100 g cooked chicken, skin removed
• 0.5 cup baby spinach or rocket