Blueberry Croissant Baked Protein Oats

Name: Blueberry Croissant Baked Protein Oats
Ingredients: 1 banana (mashed); 1 egg (or 2 flax eggs); 1½ cup soy milk; ½ tsp almond extract; ½ tsp vanilla extract; 2 tbsp melted butter; ¼ cup almond butter; 2 cups gluten free oats; 2 tbsp ground flax; 1 tsp baking powder; ½ tsp nutmeg; ½ tsp cinnamon; ½ tsp ginger; ½ cup protein powder (@botanicahealth ); ½ tsp salt; 1 cup blueberries; ½ cup almond flour; ¼ cup maple syrup; 1 tbsp melted butter; pinch salt; ½ cup slivered almonds; powdered sugar (optional)