Preheat the oven to 175 degrees Celsius (347 degrees Fahrenheit) with fan.
Grate or finely chop carrots and cauliflower, for example with a mini chopper.
Pour it into a bowl and mix with salt, eggs, and baking powder.
Now blend the oats into flour (easily done in a mini chopper) and stir into the bowl. Also, finely chop sunflower seeds in the mini chopper and stir into the bowl.
Let the dough rest for 15 minutes, so the seeds and oats can absorb some of the liquid. If the dough is still very wet afterward, add a little extra oats.
Take a lump of dough in your hand and wrap it around the sausages – place them with some space between on a baking sheet lined with parchment paper.
Bake the sausage rolls for about 25 minutes and then let them cool on a wire rack, so the bottom doesn't become soft.
Serve, optionally with ketchup.