In a large pot, bring water to a boil. Once boiling, add the sweet potatoes and cook for about <strong>15–20 minutes</strong> or until fork tender. Drain and set aside.
Add the cooked sweet potatoes to a large bowl and add in your Bourbon, Vanilla Extract, Pumpkin Pie Spice, Ground Cinnamon, Ground Allspice, Ground Ginger, Ground Nutmeg, Brown Sugar, and Melted Butter and stir.
Once mixed, mash the sweet potatoes, then add the cream and mix again.
Pour the sweet potato mixture into a greased 9×13 casserole dish and spread evenly.
Sprinkle the oats berries and cherries evenly over the sweet potato layer.
Bake at 400°F (205°C) for 35-40 minutes or until the top is golden brown and the casserole is set.
Remove from the oven and let cool slightly before serving.