Don't use your kitchen oven for powder coating! Pick up a used (possibly sitting on the curb on garbage pick-up day?) electric oven, and keep it in the garage. Powder coating will mess up your kitchen oven permanently, not to mention that your pizzas will never taste the same again
Some people have successfully used small toaster ovens for cigarette pack sized things like you mentioned. The key is accurate temperature control. Use an oven thermometer to monitor the temp, not the dial on the oven. I would still cure the powder in the garage, or out on the patio. Not in the house! Good luck!
Hemi-T