Bake the Sweet Potato: Preheat the oven to 350°.
Wash and pierce the 1 large sweet potato. Wrap in foil and roast in the oven. When cool, run through a fine mesh tamis, or beat in a stand mixer until completely smooth.
Make the Blondies: Blend ¾ cup flour and ½ teaspoon baking powder together.
Cream the 4 ounces butter, ½ cup muscovado sugar and ½ teaspoon salt in a stand mixer.
Alternate mixing in the 2 large eggs and the flour. Start with adding a 1/4 of the whisked eggs, then a ¼ cup of the flour. Repeat with the rest of the eggs and flour.
Add 1 teaspoon vanilla extract and a cup of mashed sweet potatoes.
Pour the batter into a 9x9 baking pan, no need to grease it. Bake for 30-40 minutes at 350°, rotating halfway throughout. The top of the brownies should be firm, and a toothpick inserted should come out clean.
Let the blondies cool completely before adding the pecan pie glaze.
Make the Pecan Pie Glaze: Combine 2 ounces butter, ½ cup light muscovado sugar, 2 tablespoons honey and a pinch of salt. Once it boils, turn off the heat and add 1 tablespoon heavy cream and 1 cup 2 tablespoons chopped, toasted pecans. Pour and spread evenly over cooked blondie.
Allow the topping to cool, then cut them into 1 ½ inch squares.