Full English frittata with smoky beans

INGREDIENTS

• 2 low-fat sausages , sliced
• 4 rashers extra lean bacon , all fat removed, chopped
• 150g pack button mushrooms , halved, or larger ones quartered
• 8 egg whites , or use 350ml liquid egg whites from a carton
• 3 tbsp milk
• 140g cherry tomatoes , halved
• 2 x 400g cans reduced salt and sugar baked beans
• 1½ tsp smoked paprika
• small bunch chives , snipped