Scrambled Egg and Cheese Drop-Biscuit Breakfast Sandwiches

"These scrambled eggs are so cheesy, they're almost like Mexican queso fundido. [Photographs: Daniel Gritzer] Delicious drop biscuits—quick and easy to make—are stuffed with scrambled eggs loaded with melted mozzarella cheese, a touch of feta, and plenty of fresh dill. On the surface, this may seem like a lot of work just for breakfast, but it actually couldn't be easier to prepare. Why this recipe works: * Using just a little feta and then supplementing it with mild mozzarella cheese provides plenty of feta flavor without it overpowering the eggs, plus the great texture of melted mozzarella cheese. * A base of onions cooked in butter adds depth and complexity to the scrambled eggs. * Drop biscuits are so quick and easy to whip up, this dish is a fraction of the work it seems. Note: Depending on how salty your feta is, you may not need extra salt to season the eggs: taste before seasoning...."