In a pan over medium low heat add your onions and butter. Stirring every 5 minutes or so until onions begin to brown (and reach desired caramelization. This can take anywhere from 25-40 minutes). Once onions have finished caramelizing, set aside.
In large bowl mix flour, baking powder, salt and sugar.
Cut in 6 Tbsp of the butter, and mix with hands (or in a food processor pulse about 6-8 times until butter hasn't fully blended, but little chunks are leftover. This is key to a flaky scone).
Add feta cheese, caramelized onion & fresh thyme.
Pour in the heavy cream and egg, then mix with hands until a dough forms. Roll dough out on a floured surface and form a circle about 1” thick.
Cut your dough into triangles as you would a pizza. Brush the scones with a little heavy cream for a cool matte affect, or brush with egg wash for a shinier look.
Line a baking sheet with parchment paper or lightly floured. Place scones on sheet separated 1-2 inches. Bake for roughly 20 minutes or until slightly golden.
Remove scones and let cool.
Recipe by My Lavender Blues at https://mylavenderblues.com/feta-onion-herbed-scone-a-dash-of-sweetness/