Preheat the oven to 350 degrees F. Spread all of the chopped pecans on a parchment-lined baking sheet and toast for 7 to 8 minutes. Remove and let cool, then reduce the oven to 325 degrees F.
Spray the bundt pan with cooking spray or cake release.
In a small bowl, combine 1/4 cup brown sugar, 3 tablespoons chopped toasted pecans, and 1/2 teaspoon cinnamon. Set aside.
In a medium bowl, whisk together 1 1/2 cups all-purpose flour, 1 teaspoon baking soda, 1/2 teaspoon salt, 1/4 teaspoon nutmeg, and the remaining 1/2 teaspoon cinnamon. Set aside.
In a large mixing bowl, cream 1/2 cup salted butter, softened, 3/4 cup granulated sugar, 1 teaspoon vanilla extract, 1/4 teaspoon almond extract, and 1/4 teaspoon maple extract with an electric mixer at medium-high speed until pale and fluffy, about 2 minutes.
Add 2 large eggs and beat on medium-high for 1 to 1 1/2 minutes.
Slowly add the flour mixture, 1/4 cup sour cream, and 1/4 cup Kentucky bourbon. Start on low speed until the flour begins to work in, then increase to medium-high and mix for 2 to 3 minutes, just until no streaks of flour remain. The batter will be thick.
Spoon one third of the batter into the prepared pan and tap the pan on the counter to release air bubbles, then smooth the top.
Spoon the brown sugar pecan mixture over the batter, leaving about a half inch of space around the outer edge.
Add the remaining batter over the pecan mixture and tap the pan on the counter again, then smooth the top.
Bake for 35 minutes, or until a toothpick inserted into the cake comes out clean.
Cool the cake in the pan for 15-20 minutes. As the cake cools, it starts to pull away from the sides of the pan. You should see a gap of about 1/8-1/4 of an inch between the cake and the edge of the pan at about the 15-minute mark. Turn the cake out onto a plate and cool completely before glazing, about 2 hours.
Glaze
In a small mixing bowl, combine 1 cup powdered sugar, 2 tablespoons salted butter, softened, and 3 tablespoons Kentucky bourbon with an electric mixer. Beat until smooth. The glaze will be very thick.
Spoon the glaze over the top of the cooled cake and let it drip down the sides.
Sprinkle with toasted pecans and enjoy!
Notes
The glaze butter must be softened, not melted, so it whisks smoothly.
Do not overmix the batter, as that can cause tunneling through the crumb.
The cake domes a little in the 8-inch pan and settles flat as it cools.
Bake and cool the cake up to a day ahead; keep it wrapped at room temperature, and glaze it the day you serve it.
A glazed cake keeps covered at room temperature for about three days.
To freeze, wrap the unglazed cake tightly and glaze it after it thaws.