Generally the recommendations are that a rabbit’s diet should be about 85-90% hay, 10% veg, 5% pellets.

While I also only feed my bunnies a spoonful of pellets, they are important for nutrients and vitamins. To ensure they’re getting the correct nutrients without pellets, you need to feed a huge variety of greens each day (I believe 8 to 10 different types), which isn’t practical for most of us. A small amount of a hay-based pellet won’t do any harm for most bunnies.

I give my dwarf rabbits roughly a handful of veg twice a day, (normally a variety of 3/4 types a day). I feed them various lettuces, rocket, dill, parsley, mint, coriander, kale, celery, broccoli, cauliflower, spring greens, spinach, watercress. For occasional treats, they get blueberries, strawberries or banana slices.

As with any new food, you should increase gradually, so don’t go straight from a teaspoon to a handful, and give very small portions of anything entirely new.

I give about the same amounts as @Sirius&Luna (welcome back, btw!), about a handful of leafy veg twice a day per bun, and 1 tablespoon of pellets each once a day. My bunnies are around 5-6 lbs each.

I think as long as you are seeing good hay consumption and healthy poops, no gas, etc, there is some wiggle room on veggie amounts. Herbs are nice because you can give a good variety and some enrichment without adding a lot of bulk to the diet. I volunteer at a rescue and they give 1 handful of greens per day (the size of the handful changes a bit with the size of the bun). I don’t think they are opposed to two feedings, it’s more of a logistic thing, but all the buns do well with that amount.