The oats must soak for at least 20 minutes before proceeding with the recipe.If you don't have buttermilk, use 1 cup milk + 1 tsp. white vinegar. Makes 12 muffins.
Combine buttermilk and oats in a large bowl and let stand for at least 20 minutes, up to an hour.
Preheat the oven to 375°F. Grease and line a muffin tin with 12 cupcake papers.
Add the egg, vanilla, and brown sugar to the buttermilk mixture and combine. Stir in melted butter.
Add to the bowl: flour, salt, baking powder, baking soda, and spices. Gently fold into batter but do not over-mix.
Sprinkle the raspberries and chocolate chunks into the batter and gently mix together.
Scoop batter into muffin papers.
Place muffins on the center rack and bake about 12-15 minutes.
Remove and cool in tins for 5 minutes before removing from pan onto wire rack.
Notes
TIP: Muffins stay fresh covered at room temperature for a few days, then transfer to the fridge for up to 1 week. Freeze for up to 3 months in an airtight container.