oooo, fun!
I think we do a mix of prepared and scratch. My 15 yr old dd has a massive love of Barbara's boxed mashed potatoes! So I buy her a box every week, and she makes that as her snacks. She's rail thin, so there must be something in that she needs/craves.

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I'll start with today--
Breakfast--
Dh who wakes at 5-- leftover pasta salad and coffee. For lunch, that he put togheter himself, he brought a cheese sandwich on Matthew's Whole Whaet bread, a container of leftover salad, sliced watermelon, and leftover corn on the cob. Didn't eat it.
18 yr old who left for work at 7-- Matthew's whole wheat toast, an egg from one of chickens, strawberries from our garden and water.
15 yr old who woke at 5-- whole wheat toast leftover corn on the cob, an egg from one of our chickens, strawberries from our garden.
13 yr old who woke at 7:30 - left over veggie burger (dry and cooked), leftover corn, leftover watermelon, water, and one strawberry
8 yr old, who woke at 9-- whole wheat toast, an egg from one of our chickens. strawberries she picked when she woke, water and watermelon.
Me, who ate with 13 yr old- coffee, toast, strawberries
Lunch--
Dh- Says Niscoise salad at a resturant, water, bread.
18, 15, , 8 yr old and me at home-- Grilled cheese, salad, leftover corn on the cob (I bought a heap this weekend) watermelon, water. My son also ate an apple and a banana, and my girls sliced an apple they shared.
13 yr at school- Amy's frozen enchiladas, a piece of watermelon. some salad, and water. I sent an apple, but it came home in his lunchbox.
Dinner-- Bliss potatoes on the grill tossed with olive oil, salt & pepper, red leaf salad, plus tomatoes, a small amount of avocado, shredded carrots, cukes, garbanzo beans (from a can), w/pastured organic steak I grilled with olive oil, salt and pepper-- a small piece each. Water. 13 yr old didn't eat the steak, but was satisfied with the rest of the food.
We have a mix of food, both prepared and 'assisted'. I love to cook, and I love experiemtning with recipes and creating my own. I tend to like foods with clean, fresh tastes. Those sorts of foods don't take very long to prepare, ime. There are many days I do take short cuts (canned beans, fi), too. I spend a lot of time in the kitchen, by choice, but I think that's kind of a personal preferance. Thankfully, there are many healthy short cuts for people who enjoy other creative pursuits, rather than culinary ones.