Stay-Fresh Apple Muffins!

Bahan-bahan (11 porsi)

• 2 level cups apple pieces (peeled) (, 0.7 cm / 1/3" cubes (2 large apples, I use red))
• 1 tbsp melted butter (, for muffin tim (or use paper liners))
• 115 g / 0.5 cup unsalted butter (, melted (1 stick))
• 1 cup (200g) brown sugar (, packed)
• 2/3 cup (165 ml) milk ((low fat, full fat, non dairy also fine))
• 1 large egg ((approx 60g / 2 oz))
• 1 tsp white vinegar ((or any other clear vinegar))
• 2 cups (300g) wholemeal flour ((wholewheat flour)(white also ok, Note 1))
• 1 tsp baking soda (bi carb) ((NOT baking powder))
• 1 tsp cinnamon powder
• Pinch salt
• 2 tbsp raw sugar ((demerara sugar - large granules))