Quick Apple Berry Crumble

• 3 apples, chopped into bite size pieces
• 2 cup frozen mixed berries
• 1 tbsp chia seeds
• 0.5 tsp cinnamon
• 1 cup oats
• 0.5 cup cashew nuts
• 0.5 cup mixed seeds
• 0.25 cup honey
• 0.5 cup milk
• 1 tbsp extra virgin olive oil
• 1 tsp vanilla extract
• 1 cup Greek yoghurt (optional)