Hi M.,
I was in the same situation. I didn't cook much before I had my son and wouldn't you know it but he is actually one of those kids that really likes to eat. To complicate further, he has nut/peanut allergies. Since I don't really want to spend all day in the kitchen, I have a few easy things. You may want to try these. I get the soy meatballs from Trader Joes. They also have meat and turkey. Then I make some spaghetti with sauce from a jar. Also I get soy corn dogs. Costco has healthy, nitrate-free hotdogs - the brand is Colemans. Trader Joe also has some nitrate free lunchmeat for sandwiches but the sodium is still high. So this is another meal. Pre-made chicken nuggets (some are more healthy than others), and corn. I get Trader Joe garlic mashed potates. My son loves these. Also baked potatoes are good with a little cheddar cheese on top. Sometimes I do taco night. Fry up some lean ground beef, shred some chesse, cut some lettuce and tomatoes. You can even add refried or regular beans. Taco night is fun and it gets more fun when your kid stuffs his own tacos. You put all the ingredients in little bowls and everyone creates their own perfect taco. Sometimes I make black beans and white rice and if I feel like I want to cook really healthy, I actually use brown rice. My son will eat this if I add some seasoning like garlic and onion. Beans are really healthy so I hope you like them. Sometimes I make pasta with white beans and these are creamy, and add a bit of olive oil. I get bored cooking the same things too, so I get recipes from the internet or my friends of varying ethnicities/cuisines. Lately, I've tried Indian food. Sometimes these experiments work out, sometimes not. I guess it takes practice. My son likes edamamme and he is not allergic to soy. He likes to pluck them right out of the pod. Chicago has some good cheap ethnic restaurants. Sometimes it just isn't worth it to cook at home. You can get relatively healthy food from a restaurant. By the time Friday rolls around, I need a break, and we get a pizza from Barnaby's or go to Argyle Street (little Vietnam). Sometimes I do a stir fry, with beef cut into thin pieces fried in a little oil with a bag of frozen chinese veggies. Also, we get a pizza crust from Whole Foods, mozzarella cheese and my son helps to make a pizza. I have other ideas but they are not so healthy so I won't mention them. We eat mostly healthy but have a few yummy not so healthy ones sometimes. As far as Grocery shopping goes, stick to the outside aisles. The inner ones have mainly the prepared foods that are not that healthy. Also Trader Joe is a really good grocery store. Whole Foods is good but you could spend your Whole paycheck here. I'm sure you'll get some more ideas from people, and you'll be making some yummy meals for your family soon.