Slow Cooker Beef and Mushroom Stroganoff

• 1 kg slow cooked beef chuck steak, diced
• 2 tbsp plain flour
• 400 g fresh sliced mushroom cups
• 1 brown onion, diced
• 3 garlic cloves, crushed
• 500 ml real beef stock, salt reduced
• 3 tbsp tomato paste
• 1 tbsp dijon mustard
• 0.75 cup plain greek yoghurt
• 500 g wholemeal pasta
• 400 g broccoli, cut into florets
• 300 g green beans, ends removed