Step 1: Preheat the oven to 400° and position racks in the upper and lower thirds. Line 2 baking sheets with parchment paper. In a large bowl, whisk the flour with the salt, baking powder and baking soda. Using a pastry blender or 2 knives, cut in the butter until it is the size of small peas. Add the buttermilk and stir until a shaggy dough forms.
Step 2: Turn the dough out onto a floured surface; knead until it comes together. Pat the dough 3/4 inch thick. Using a 3 1/2-inch round cutter, stamp out as many biscuits as possible. Reroll the scraps and stamp out more biscuits.
Step 3: Transfer the biscuits to the baking sheets and bake for about 30 minutes, until golden and risen, shifting the pans halfway through baking. Let the biscuits cool.
Step 4: Split the biscuits and spread with butter. Preheat a griddle and cook the biscuits, cut side down, until golden. Fill the biscuits with ham, cheddar and fried eggs. Spread with raspberry jam, if desired. Close and serve.