Pumpkin Pie Smoothie Bowl

2 frozen ripe bananas, peeled prior to freezing
½ cup pumpkin puree, not pie filling
1–2 medjool dates, pitted
2 tbsp almond butter
½ tsp vanilla extract
½ tsp cinnamon
⅛ tsp nutmeg, optional
⅛ tsp allspice, optional
¼ cup oat milk, or any plant-based milk

TOPPINGS (OPTIONAL)
Granola
Pumpkin seeds
Crushed pecans
Sliced banana
Almond butter