Preheat the oven to 400 degrees F.
Grease a muffin pan with cooking spray, or line with muffin liners.
In a large bowl, whisk together the buttermilk, sugar, oil, egg, orange zest, and vanilla extract.
Add the flour, baking powder, baking soda, and salt, and stir until combined with a spatula.
Fold in the raspberries.
Divide evenly between the muffin cups.
Bake in the preheated oven for 18-20 minutes, until slightly golden and a toothpick comes out clean.
Cool in the muffin pan for about 10 minutes and then cool completely on a cooling rack.
Enjoy!