Preheat oven to 350 degrees. Grease and flour bundt pan and set aside.
Cream butter in a mixer or food processor until smooth and a slightly lighter shade of yellow (about two minutes). Add eggs, brown sugar, honey, milk, and vanilla extract and continue mixing until uniform (about 5-8 more minutes).
1 pound unsalted butter, 6 eggs, 1 cup brown sugar, ½ cup honey, ¾ cup milk, 1 teaspoon vanilla extract
Meanwhile, peel, core, and dice both the peaches for the cake and the glaze into half-inch chunks.
1 large peach, 1 large peach
In another bowl, whisk together flour, salt, and cinnamon. Dredge the diced pieces of one peach in flour mixture until coated then add the creamed butter mixture and stir by hand until just combined and no dry pockets remain. There may be bits of flour around the peach pieces, which is OK.
4 cups flour, ½ teaspoon fine sea salt, ½ teaspoon cinnamon
Pour batter into prepared bundt pan. The batter will be thick and sticky and you shouldn't see many peach pieces from the top of it if they're evenly distributed throughout the batter. Bake on middle oven rack for about an hour or until a toothpick inserted into multiple parts of the cake comes out clean.
Let cake sit in pan for about 10 minutes then carefully invert it onto a plate to finish cooling.