Preheat your oven to 350°F (175°C).
In a medium bowl, whisk together the flour, baking powder, and salt until well combined. Set aside.
In a large mixing bowl, beat together the softened unsalted butter and white sugar until creamy and light, about 2-3 minutes.
Add the large egg and grated orange peel, and beat until well combined.
Pour in the fresh-squeezed orange juice and mix until fully incorporated.
Gradually add the dry ingredient mixture into the wet ingredients, stirring gently until just combined.
Drop spoonfuls of dough onto a parchment-lined baking sheet, spacing them about two inches apart. Bake for about 10 minutes or until lightly golden around the edges. Let cool on a wire rack before glazing.