Made some turkey burgers just yesterday, must say, first off, I put half an onion and two small cloves of garlic, finely diced in there, but then I'm not as strict on carbs as most. But the main ingredients were simply a big pack of turkey mince, salt, pepper, some chilli powder, chilli flakes, a large amount of smoked paprika, a splash of oil or two tablespoons of ghee, stir that all together with a fork, add an egg to bind it all and simply mush it up with your hands. Squeeze it through your fingers until it's a blended paste, then use an ice cream scoop if you have one to make the mix into equal sized meatballs. Heat your oven to 180c (fan) as you will need to keep the burgers hot as you cook them in batches. Heat a large frying pan (skillet) and then press each ball into a flat round burger shape in your hand (or use one of those burger presses they have now) and place in the pan. Fry on each side for a few minutes until nicely browned or starting to blacken if you prefer. Place in the oven on a baking try and cover with tin foil whilst you do the next batch.
That's what i do anyhow. Herbs and things are fine but I didn't have any in the cupboard; I did have a lot of smoked paprika, though! You can also add things like a smidgeon of star anise or ground cumin or curry powder to change things up; watch it on the star anise and cumin, as they will overpower anything. Tiny amounts.
You can also slice up some bell pepper and fry it in butter and chilli flakes for a spicy accompaniment, etc.