Heat oven to 350°F.
Grease a12-cup bundt cake pan with vegetable shortening and generously sprinkle granulated sugar to cover the surface. Set aside.
In large bowl, cream the butter and brown sugar with electric mixer on high speed, about 2 minutes.
In medium bowl, whisk together flour, baking powder, baking soda, and salt.
In separate bowl, whisk together the maple syrup, milk, sour cream, eggs, and vanilla.
Alternating between the flour mixture and egg mixture, add to butter mixture in 3 additions, mixing well after each addition. Pour batter into pan, spreading evenly with spatula.
Bake 35 to 40 minutes or until edges are golden and a wooden skewer inserted into the center comes out mostly clean.
Cool 15 minutes in pan. Place a serving platter on top of the bundt pan and invert to transfer the cake to the platter. Cool completely, about 1 hour.
In small bowl, beat glaze ingredients with whisk until smooth. Add more powdered sugar or maple syrup if necessary for desired consistency. Drizzle glaze over cooled cake, letting it drip down sides. If desired, top the glaze with sugared pecans. Let glaze set at least 30 minutes, or more, before serving.
In a saucepan, whisk together maple syrup, water, brown sugar, granulated sugar, cinnamon, and salt. Heat over medium-low heat, stirring until sugars dissolve.
Add in pecans, stirring until well-coated. Continue to cook, over medium-low heat and stirring constantly, until liquid completely evaporates. Cook another 1 minute, stirring constantly.
Immediately remove from heat and spread pecans, in a single layer, on a parchment-lined baking sheet.
While pecans are still hot, sprinkle with cinnamon sugar and toss to coat. Spread into a single layer and allow to cool completely. Use to garnish glazed cake.
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