Preheat your oven to 350°F (175°C) and grease a donut pan.
In a mixing bowl, combine flour, sugar, baking powder, salt, and cinnamon, whisking until thoroughly mixed.
In a separate bowl, whisk together buttermilk, maple syrup, and egg until well combined.
Pour the wet ingredients into the dry ingredients, stirring until just combined.
Gently fold in the raspberries and crumbled bacon into the batter.
Spoon the batter into the prepared donut pan, filling each cavity about two-thirds full.
Bake in the preheated oven for about 12-15 minutes or until a toothpick inserted in the center comes out clean.
Allow the donuts to cool for a few minutes before transferring them to a wire rack.
In a small bowl, mix powdered sugar with milk to create a glaze, adjusting for desired consistency.
Once the donuts are completely cool, dip them in the glaze and top with remaining crumbled bacon if desired.