Gather all your ingredients and let the butter sit at room temperature until it’s soft.
In a mixing bowl, combine the room temperature unsalted butter and granulated sugar. Cream together until light and fluffy, about 2-3 minutes.
Crack in 1 large egg and add 1/2 teaspoon of pure vanilla extract or vanilla bean paste. Mix until well combined.
In a separate bowl, whisk together 1 1/2 cups all-purpose flour, 1 teaspoon finely ground Earl Grey tea, and 1/2 teaspoon kosher salt.
Gradually add the dry ingredients to the butter mixture, stirring until just combined. Avoid overmixing.
Turn the dough onto a lightly floured surface and shape into a log about 1.5 inches in diameter. Wrap in plastic wrap and refrigerate for at least 30 minutes.
Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
Slice the chilled dough into 1/4-inch thick rounds and place on the prepared baking sheet.
Bake for 12-15 minutes or until edges are lightly golden.
Remove cookies from oven and cool on the baking sheet for 5 minutes. Transfer to a cooling rack to cool completely.
In a small bowl, whisk together 1/4 cup sifted powdered sugar and 1 tablespoon freshly squeezed blood orange juice until smooth. Adjust consistency as needed.
Drizzle the blood orange glaze over the cooled cookies. Allow glaze to set before serving.