Preheat your oven to 400 °F and spray a muffin tray with non-stick cooking spray. Set aside.
In a small bowl, prepare your flax egg by whisking 1 tablespoon of ground flaxseed with three tablespoons of water. Set aside to gel while you prepare the rest of the batter.
In a large bowl, whisk together the dry ingredients (flour, sugar, baking powder and salt).
Add in the wet ingredients and mix until just combined.
Fold in the raspberries and chocolate chips. Evenly divide the batter among the 12 muffin tins and bake for about 20 minutes until a toothpick inserted into the middle comes out clean. Allow the muffins to cool slightly before removing from the pan.
Notes
Store in an air-tight container outside of the fridge for a couple days or in the fridge for up to a week. Best when warmed slightly before serving.