Peanut butter squares/bars (like a rich peanut butter cup)

Bars are gluten free if using GF graham crackers. (I found these in the GF aisle of Safeway and am sure YES or WF would have a version too.)

Ingredients

1/2 cup salted butter, melted
1 cup graham cracker crumbs (about 8 full sheets)
1 cup confectioners' (powdered) sugar
3/4 cup + 2 Tablespoons creamy peanut butter (not natural style)
1 cup semi-sweet chocolate chips
Instructions

Line a 8x8 or 9x9 square baking pan with aluminum foil. Set aside.

In a medium sized bowl, mix the melted butter, graham cracker crumbs, and powdered sugar together until combined. Stir in 3/4 cup of peanut butter. Spread into prepared baking pan.

In a small bowl, microwave 2 Tablespoons of peanut butter with the chocolate chips until melted. Stir until smooth. Spread over peanut butter layer.

Chill until completely firm, at least 3 hours.

I made vegan gluten free rice crispy treats. Easy and kids liked them

I think you're more motivated than me - 30 min is a lot of time

But some easy ideas:
-the GF break & bake cookies re-shaped (I used these to make a choc chip gingerbread man for my kids class project)
-GF cupcakes or mini-muffins with orange icing. You could use a GF mix or just buy the muffins and put icing on top.

And this has some good ideas - I thought the apple teeth looked like a good mix of easy and fun:
http://www.themultopadventures.com/

But how old is your kid? As long as I have a favorite treat, mine seems to be really OK with iit being different (she's 6). So I make sure we have something, but don't stress too much about exactly what it is. Though I also always have cupcakes in the freezer so I can just grab one for birthday parties, etc.

You'll most likely not find large GF pretzles other than rods. But you can still make silly pretzles with the small GF pretzles. Melt a Hershey kiss or a rolo over the pretzles and top with an orange m&m or candy corn.

http://www.recipetips.com/recipe-cards/t--2829/chocolate-drop-pretzels.asp

GF cookies with Reece's Pieces in them. Cupcakes with orange frosting and spider rings on top.

Pamela's GF espresso chocolate chip cookie is my absolute favorite:

http://www.pamelasproducts.com/products/cookies-and-biscotti/cookies/espresso-chocolate-chunk-cookies/

But your kid will probably prefer the standard chocolate chip.

MOMS, Trader Joes, Whole Foods have pretty good selection of GF.

Sweet Sin Bakery is carried at MOMs & Lilit Cafe if you want pre-made cupcakes.

I guess I'm looking for something that is similar and most likely be served as regular treats, like cupcakes/cookies. Don't want my child to feel like he's left out all the times when it comes to cookie/cake time.
I searched some online and i'm not sure if i have that kind of time or skills. Something i can do within 30 minutes would be nice.
Like funny pretzels. Where can i find these huge GF pretzels?

Anything in particular you're looking to make? Can do just about all treats GF if you want.

GF rice Krispy treats made with GF Rice Krispies, mini cupcakes made with Betty Crocker GF cake mix. There are a lot of candies out there that are gluten free if you are looking for something packaged.

http://celiacdisease.about.com/od/glutenfreefoodshopping/a/GFcandies.htm

I need some GF Halloween treats/cupcakes/desserts/snacks for kids !