My daughter has been gluten free for about two years. Talk about an adjustment!!
Betty Crocker has gluten free brownies, cake mixes and cookies. They are around $5 a box, but they are absolutely the closest to "regular" food. Betty Crocker also has a rice flour blend which is very good.
Also, forget all the GF pastas that you buy in the health food stores or Whole Foods. Not only are they incredibly expensive, but they are AWFUL!! Muellers pasta now makes GF fusilli, spaghetti and rotelli. Each box contains 8 oz and is $1.59. More expensive than Non-GF, but tastes wonderful and the consistency/texture is wonderful. And MUCH LESS expensive than GF pasta you buy at Whole Foods or health food stores.
Try Betty Crocker GF mixes. You will be pleasantly surprised!!

I make my own flour mix - straight rice flour didn't have good results for me. Rice flour, brown and/or white, coconut flour with a little tapioca flour for cakes, and GF oatmeal flour for cookies and muffins. Xanthan gum is added at time of baking. I make my mix in a large quantity so I don't have to haul everything out each time. I like Namaste spice cake mix, Bob's Red Mill vanilla cake, and Tinayada brown rice pasta. My mix makes great choc chip cookies using any 'regular' recipe.

I can't have yeast or corn, either, so I so am really label reader. I'm sure you are aware no gluten means no barley or rye, either. Oatmeal is iffy. I can use Meijer's organic - my son in law can have none. Soy sauce is made from fermented wheat and the list goes on. Lauriejo is right. The closer to natural, the better.

Betty Crocker has a mix for chocolate chip cookies for under $4. Check your supermarket for their gluten free items. Cheaper then the health food store. I made these cupcakes and even my husband liked them.

1 cup rice flour
2 teas. baking powder
1/4 teas. salt
1/2 cup sugar
1/3 cup butter, softened
1 egg
1 teas. vanilla extract
3/4 cup milk
Sift butter, baking powder and salt and set aside. Cream sugar and butter with mixer and beat in egg and vanilla. Stir in flour until combined. Spoon in muffin cups and bake 20 minutes. Frosting of choice. I use the butter cream on the confectioner sugar box.

Again many thanks. I've learned a lot from your posts and appreciate the resources and recipes. So far I'm on track and doing really well diet wise.

I'm learnng celiac disease and GF baking too
 

I had to go gluten free suddenly after an intestinal illness. I've sampled a few GF products and my favorites so far are Udi's bread and Jules GF flour from online. I made cornbread with it and it browned nicely and had a nice center. If I need to make gravy, I use my GF flour and my family has never complained so I use it for breading my chicken too. It's made it easier adapting.

My 4 year old is allergic to wheat, peanuts, and a bunch of other things. By proxy, we are all gluten free.
He's a typical little boy, and wants a treat every now and again. I found that buying the individual ingredients to make baking mixes to be a pain. But, my local Big Lot's carries Bob's Red Mill mixes. You don't have Big Lot's in California, but they sell online, and you won't find better prices.
The cinnamon raisin bread, the white sandwich bread, the shortbread cookie mix, the pancake mix and the brownies are all very tasty and as close to the "real thing" as I've tried.
Just another option for you.

King Arthur flour has lots of recipes, even for making your own flour.

I was diagnosed with Celiac disease 9 years ago and have been eating gluten-free ever since. I have found tons of web sites that I just love. One is http://glutenfreegoddess.blogspot.co...ipe-index.html
Another is http://glutenfreefromutah.com/
There are tons of gluten-free websites. There are also lots of cookbooks now. Good luck and I hope you will feel better.