Preheat your oven: 180°C / 350-375°F / Gas Mark 4-5.
Muffin tin: use spray oil or softened butter to grease either a 6 cup Texas Muffin tin or regular 12 cup muffin tin.
Oatmeal: combine oats, buttermilk, oil and egg in a large mixing bowl. Give it a stir and then let it sit for 10 minutes to create the oatmeal. Use this time to mash the bananas.
Dry ingredients: add flour, sugar, baking powder and salt to the wet ingredients. Use a wooden spoon and stir to combine.
Raspberries and bananas: add raspberries and mashed bananas and stir gently to combine.
Bake: spoon into muffin tin and oven bake for 30 mins. Use a skewer inserted into the centre of one muffin to see if they are done. If it comes out clean they are. If is has wet raspberries or banana, test in another part of the muffin, it should have no wet batter.
Cool: use an oven mit to remove the muffin tray from the oven and place on a wire rack. After about 5 mins, remove muffins from tin by running a butter knife around the edges and allow to cool.
Serve and enjoy: to serve the muffins, microwave for 1 to 2 mins, smear with butter, drizzle with honey and dust with icing sugar!