To make the cake:
Preheat oven to 350°F. Grease a 9-inch bundt pan with butter and dust with flour, or coat well with nonstick cooking spray.
In the bowl of a stand mixer fitted with a paddle attachment, or in a large bowl with a hand-held mixer, beat the butter and brown sugar on high speed until light and creamy, about 3-4 minutes, scraping the bowl down as needed.
In a bowl combine the flour, baking powder, baking soda, and salt. In another bowl whisk together the maple syrup, sour cream, eggs and vanilla. Add the flour mixture to the stand mixer bowl in 3 additions, alternating with the maple syrup mixture and ending with the flour mixture. Mix only until just combined.
Scoop the batter into the prepared bundt pan and spread it out evenly. Bake until golden brown and a toothpick inserted into the center comes out with a few moist crumbs, 35-40 minutes. Let cool 15 minutes in the pan before turning it out onto a wire rack to cool completely.
To make the whipped cream:
In the bowl of a stand mixer fitted with a whisk attachment, or in a bowl with a hand-held mixer, beat the whipping cream to soft peaks. Add 2 tablespoons of the maple syrup and again whip to soft peaks. Taste and add remaining tablespoon of syrup if desired.
Top cooled bundt cake with whipped cream and drizzle with additional maple syrup right before serving.
Calories: 538kcal, Carbohydrates: 67g, Protein: 5g, Fat: 28g, Saturated Fat: 17g, Cholesterol: 110mg, Sodium: 218mg, Potassium: 299mg, Fiber: 1g, Sugar: 43g, Vitamin A: 933IU, Vitamin C: 1mg, Calcium: 148mg, Iron: 2mg