We use a counter top convection oven. I'm sure my wife got it on QVC or HSN and I believe it's a Wolf Gang Puck signature model. It works really well and is a little bigger than the old toaster ovens.
The oven in your TT may need some adjusting to make it work better. Any stove repair tech would be able to adjust it properly. Keep in mind, the RV ovens are notorious for incorrect temperature levels, so it is best to use an oven thermometer and adjust accordingly. Ours is 25 degrees too hot. So instead of 400 degrees we use 375 and it works great.
Once you turn the knob on it can take awhile for the oven to light and heat up. You have to be patient.