HEAT oven to 350°F. COAT large nonstick skillet with cooking spray; HEAT over medium-high heat until hot. ADD potatoes, mushrooms and water; MIX and SPREAD in even layer. COOK, covered, 8 minutes. TURN vegetables over; COOK, uncovered, until soft, about 6 minutes.
REMOVE from heat. ADD spinach, sour cream, 1/4 cup cheese and dill weed; MIX well.
DIVIDE mixture evenly among four greased 10 oz. ramekins or custard cups. PRESS an indentation (about 2-inch diameter) into center of mixture with back of spoon. PLACE on baking sheet.
BREAK and SLIP an egg into each indentation. SPRINKLE with remaining cheese. BAKE in 350°F oven until whites are completely set and yolks begin to thicken but are not hard, 25 to 30 minutes.
This recipe is an excellent source of protein, vitamin A, folate and choline.