Always looking for a dessert to take to a concert picnic.

Try these pecan pie muffins! They are easy and transportable but look awful pretty! https://food52.com/recipes/29103-pecan-pie-muffins

Are you in Colorado...because you could get some REALLY good brownies.

This recipe I posted is quite easy and definitely travels. I took 50 of them on a 9 hour plane ride a month ago and they survived 5 days in a bus afterwards! https://food52.com/recipes/29307-raspberry-crumble-oat-bars

I understand your desire for a glamorous dessert, but if the tart gets crushed in transit, or the weather is really hot and sticky, bar cookies are more forgiving. And I don't know anyone who doesn't like brownies or blondies.

Did you see the article here yesterday about fruit galettes? Given your preference for individual tarts or cobblers, you could make smaller ones (I make galettes often, and don't see a problem adapting to individual size): https://food52.com/blog/10954-how-to-make-a-summer-fruit-galette-and-why-you-should

classic cookies like chocolate chip or oatmeal raisin

I love Silver Palate's pecan squares. I had a wholesale dessert biz moons ago and the grocery stores and bakeries that I sold too couldn't stay stocked. It's a shortbread crust on the bottom and then the top layer is nuts, honey, butter and brown sugar. I made them with pecans or macadamias (my favorite). Sometimes I added mini choc chips and sometimes I didn't. They travel very well and can be made ahead of time.

Alice Medrich's brownies. Super easy and so fun to end a meal with chocolate.

Bar cookies. Just do a search on this site... enough options to keep you busy for a while. :-)

We've got some awesome picnic menu ideas right here:

https://food52.com/blog/10645-community-picks-picnic

The blueberry galette is a personal favorite. You can also make individual galettes, or hand pies for easy eating:

https://food52.com/blog/10390-rhubarb-hand-pies-the-perfect-picnic-dessert