Tarte Tatin was the goal. Though I could not find a gluten free recipe for it... so instead I made some clafouti, a rustic French classic.
1. wash plums then rough chop into large bits. shake some cinammon and lots of white sugar on top. add a healthy dose of vanilla extract. stir and let sit for a bit until juices start to flow. (resist the urge to snack on these. they're scrumptious with ice cream or yogurt)
2. butter a not-too-deep-casserole dish, then sprinkle white sugar over the dish (more sugar! don't be stingy)
3. toss the plums in and arrange them so that they are not touching
4. in a small bowl mix 1/3 cup rice flour, 2 tbsp tapioca starch, 1/2 tsp xanthan, and a pinch of salt
5. in a small sauce pan heat 1 cup milk and 1 tbsp butter until it gets a little bubbly, but just a little
6. in another bowl (yes, i know.. so many dishes) beat 2 eggs and 1/3 cup sugar until light and fluffy. Blend in milk and add a touch more vanilla. add in flours
7. pour over plums in dish
8. bake in a 400F preheated oven until puffy and golden. The recipe that I used suggested 30-35 mins, but mine seemed to be ready in less than 30 and was not so golden, it was more of a maize or pancake colour.
if your not a plum fan, though this recipe might convince you otherwise, consider using cherries, apples, pears, or figs.