Step 1: Prepare the Topping: In a skillet over medium heat, melt the vegan butter or coconut oil. Stir in the brown sugar and 1 teaspoon cinnamon until combined. Add the apple slices and cook for about 5-7 minutes, or until the apples are slightly softened and caramelized. Remove from heat and set aside.
Step 2: Preheat the Oven: Preheat your oven to 350°F (175°C). Lightly grease a 9-inch round cake pan.
Step 3: Arrange the Apples: Pour the caramelized apple mixture into the bottom of the prepared cake pan, spreading it evenly.
Step 4: Make the Cake Batter: In a large mixing bowl, whisk together the flour, granulated sugar, baking powder, baking soda, salt, and 1 teaspoon cinnamon.
Step 5: Combine Wet Ingredients: In a separate bowl, mix together the almond milk, vegetable oil (or melted coconut oil), apple cider vinegar, and vanilla extract.
Step 6: Combine Wet and Dry Ingredients: Pour the wet ingredients into the dry ingredients and mix until just combined. Be careful not to overmix; a few lumps are okay.
Step 7: Pour the Batter: Gently pour the cake batter over the arranged apples in the cake pan, spreading it evenly with a spatula.
Step 8: Bake: Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted into the center comes out clean and the top is golden brown.
Step 9: Cool and Serve: Allow the cake to cool in the pan for about 10 minutes. Then, carefully invert the cake onto a serving plate. Lift the pan gently to reveal the beautiful caramelized apple topping. Let it cool slightly before slicing and serving.