Preheat oven to 400 degrees.

In a small bowl, stir the oats and buttermilk together. Let stand for 25 minutes. (If you want extra oat flavor, before combining, toast the oats in a skillet on low heat until they brown, or in an oven for 30 minutes at 300 degrees.)

In a large bowl, combine flour, brown sugar, baking powder, baking soda, and dried plums.

Add the butter and with a pastry blender or your fingers, work in the butter until it resembles coarse crumbs.

Stir in the oats and buttermilk. Don't overmix.

Pat the dough into a round flat circle about 8 inches in diameter.

Mix the egg and teaspoon of cream together in a small bowl. Then using a pastry (or basting) brush, coat the top of the dough.

Sprinkle sanding sugar over the top. I like a lot of sugar, but it's up to you.

Cut into 8 slices and place on cookie sheet lined with a silpat or parchment paper.

Bake for 20 minutes or until the tops start to brown.

Serve them warm with cream, butter, and jam.