Preheat your oven to 350�F (177�C) and grease a 10-inch Bundt pan. Sprinkle pecans into the pan.
Mix flour, baking powder, and salt in a big bowl. Then, use a mixer to blend butter, brown sugar, granulated sugar, and orange zest until creamy. Add eggs, sour cream, and vanilla. Beat until mixed.
Add dry ingredients to wet ones while mixing on low. Slowly add rum and milk. Beat until everything's mixed well. The batter will be thick.
Pour/spoon the batter over the pecans in the pan.
Bake for 55-70 minutes until a toothpick comes out clean. It might take a bit longer since it's a hefty cake.
Let it cool in the pan for 45 minutes to 2 hours. Then, flip it onto a rack or dish.
Make the glaze by melting butter and rum in a pan. Add vanilla, salt, and confectioners� sugar. Drizzle the warm glaze over the cake.
Store leftovers tightly covered at room temperature for up to 2 days or in the fridge for up to 1 week. Enjoy!