Prep. Set oven rack to middle position. Preheat oven to 400ºF (204ºC).
Dry ingredients. In a large mixing bowl, add flour (2 cups), 1/4 cup brown sugar, baking powder (1 teaspoon), baking soda (1/2 teaspoon), and salt (1/2 teaspoon); whisk to combine. Add 6 tablespoons of butter and cut in with a pastry blender or 2 knives until the butter is the size of peas. Stir in pecans (3/4 cup).
Wet ingredients + combine. In a medium bowl, whisk together buttermilk (2/3 cup), eggs (2), and maple extract (1 teaspoon). Add to flour mixture and toss with a fork until dough comes together in moist clumps.
Shape + bake. Gather dough into a ball. Press into out onto a lightly floured surface to an 8 inch round cut into 6 triangles. Arrange triangles on an ungreased baking sheet, about 2 inches apart. Bake in preheated oven until a toothpick inserted in the center comes out clean, about 14-16 minutes.
Glaze. In a small saucepan, whisk together the remaining 1/2 cup brown sugar, 4 tablespoons butter, and heavy cream over low heat until sugar dissolves. Remove from heat and whisk in powdered sugar (2/3 cup) and molasses (1/2 teaspoon). Spread glaze over warm scones.
Notes
Butter: I generally use unsalted butter in my recipes. I like that I can control the amount of salt. It’s very important to use very cold or frozen butter. This will create tender flaking in your scones and help them get a gorgeous rise. What I do is cut the butter into 1/4 inch cubes, lay the cubes in a single layer on a plate, and stick the plate in the freezer for about 10 minutes.
Mixing: Don’t over-mix! Lumps in the batter are okay! The best tool to use is a pastry blender.