Preheat the oven to 350°F (175°C). Grease a 9-inch round cake pan.

In a mixing bowl, whisk together the all-purpose flour, almond flour, sugar, baking powder, baking soda, and salt.

In another bowl, combine the almond milk, melted coconut oil, apple cider vinegar, and vanilla extract.

Pour the wet ingredients into the dry ingredients and mix until just combined.

Pour the batter into the prepared cake pan and smooth the top.

In a small bowl, mix the chopped pistachios with brown sugar and sprinkle over the batter.

Bake in the preheated oven for 30 minutes or until a toothpick inserted into the center comes out clean.

Allow to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.