My Grandmother's Best Fry Deep-Fried Oreos

Ingredients

• 1 cup all-purpose flour (120g)
• 1 tablespoon granulated sugar (12g)
• 1 teaspoon baking powder
• 1/4 teaspoon salt
• 1 large egg
• 1 cup whole milk (240ml)
• 1 teaspoon vanilla extract
• 1/4 teaspoon cinnamon (optional)
• Vegetable oil (for frying)
• Powdered sugar (for dusting)
• Chocolate sauce or whipped cream (optional, for drizzling)