Infuse the Cream with Earl Grey
Pour whipping cream into a small saucepan and add 4 Earl Grey tea bags.
Heat over medium-low heat until cream just begins to scald (steam rising and tiny bubbles forming around edges), about 5 minutes.
Transfer cream and tea bags to a heat-safe container. Cover surface with plastic wrap pressed directly onto cream.
Let steep as it cools completely, then refrigerate for 2-4 hours or overnight for maximum flavor.
Prepare the Scone Dough
Preheat oven to 375°F (190°C). Line a baking sheet with parchment paper.
In a large bowl, sift together flour, sugar, baking powder, and salt. Whisk to combine.
Cut cold butter into small cubes and rub into flour mixture with fingertips until it resembles coarse breadcrumbs with pea-sized butter pieces.
Open 2 remaining tea bags and add loose tea directly to flour mixture (pulse in spice grinder first if using coarse loose leaf). Mix with a fork.
Bring the Dough Together
Remove tea bags from infused cream, squeezing gently. Reserve 2-3 tablespoons cream for glaze.
Whisk together remaining Earl Grey cream, 2 eggs, and vanilla extract.
Make a well in dry ingredients and pour in wet mixture. Mix gently with wooden spoon until just combined.
Turn dough onto lightly floured surface and knead gently 3-4 times until it comes together.
Shape and Bake
Pat dough into a circle about 1 inch thick and 8 inches in diameter.
Cut circle into 8 equal wedges using bench scraper or sharp knife.
Transfer wedges to prepared baking sheet, spacing 2 inches apart.
Brush tops with beaten egg.
Bake for 18-22 minutes until golden brown on top.
Transfer to wire rack and cool completely before glazing.
Make the Earl Grey Glaze
In a small bowl, combine melted butter, powdered sugar, and vanilla. Mix until smooth.
Add reserved Earl Grey infused cream, one tablespoon at a time, stirring after each addition. Add milk if needed to thin.
Dip top of each cooled scone into glaze, let excess drip off, and place back on wire rack.
Let glaze set for 10-15 minutes before serving.