Preheat the oven to 375 (F); for sea-level, preheat the oven to 350 (F).
Spray the donut cavities in your donut pan with cooking spray. I like to use Coconut Cooking Spray Oil from Spectrum, but any kind will do. If you don't have any cooking spray, use unsalted butter to generously butter the cavities in your pan. Put 1 cup flour, 1/3 cup plus 1 tablespoon sugar, 1/2 teaspoon baking powder*, and 1/2 tablespoon salt in the bowl of a freestanding electric mixer with a paddle attachment and beat on slow speed until everything is combined. If you don't have a freestanding electric mixer, use a regular ol' whisk. Gets the job done just as well!
Add 1/2 tablespoon melted butter, 1 egg, 3 tablespoons milk, 3 tablespoons cream, and 1 tablespoon orange zest to the flour mixture. Beat until well blended. Again, if you don't have a freestanding electric mixer, you can stir these ingredients by hand this time using a rubber spatula instead of a whisk.
Once the batter is ready, fill your piping bag (or makeshift Ziploc piping bag :-) ) with the batter and fill each donut hole until two-thirds full. Be careful not to put too much dough into the cavities or you'll end up with donuts without any holes!
Bake for 14 - 16 minutes (for sea-level, bake for 8-10 minutes) or until the donuts spring back when lightly touched. Don't worry if they look pale -- trust me, the other side will be cooked. Place the baking tray on top of a cooling rack and let the donuts cool in the pan for a little bit before trying to unmold them.
Once the donuts have cooled, prepare the Earl Grey Tea glaze. Bring 3 tablespoons of water to boil in a small saucepan or in a tea cup in the microwave. Remove from heat, add 1 Earl Grey tea bag, and let steep for at least 5 minutes. The longer you let the tea steep, the stronger your glaze will taste of Earl Grey. Since it's a very subtle flavor in the first place, I recommend steeping the water for around 10 minutes or so.
In a medium bowl, stir together 1 cup confectioner's sugar, 1 tablespoon plus 1 teaspoon Earl Grey tea (from the water you just boiled), and 2 teaspoons milk until the sugar is completely dissolved and you are left with a liquid paste-like substance.
Add a couple more drops of Earl Grey tea for a stronger flavor if you like. Stir the glaze until the color is uniform -- it should be a cream color at this point. Use immediately to glaze the donuts! If not the glaze will harden. The best way I found to glaze the donuts was to dunk the top halves of each donut into the bowl containing the glaze. Once the top has been glazed, lay the unglazed part of the donut on top of a cooling rack with a plate underneath -- this will allow excess glaze from the donut to drip onto the plate.
Once the donuts have been glazed, sprinkle immediately with your chosen decorations (e.g., sprinkles, orange zest, Earl Grey tea leaves). If you wait to decorate the donuts, the glaze will harden and the decorations will not stay on the glaze.