A canning jar is essentially a ramekin. Anything that you can bake in a ramekin can also be baked in a canning jar, with the added advantage that you can screw a lid on a canning jar and take your food with you!
1. Salads - From grain salads and fruit salads packing it in jars is an easy way of passing out portions at a picnic.
2. Cupcakes and Quick Breads - Jars keep the crumb-factor to a minimum (plus help us with portion control). You can bake them right in the jar or portion them afterward, like these cute Red Velvet Cupcakes from Eat Drink Pretty.
5. Egg Dishes - Frittatas are baked in the oven, right? Portion the egg mixture into ramekins instead and we have brunch-on-the-go.
7. Full Meals - That idea for a BBQ meal in a jar might be on to something. Rather than packing lots of tiny containers, why not put the whole meal in a larger canning jar?
What other dishes do you think work well "in a jar"?