We're not vegetarian but we try not to eat meat more than once or twice a week, so DD was mostly weaned on veggie stuff.
There's an instagram called Little Veggie Eats (it's a book too if you want to look for a cheap copy) that has some good ideas.
I found SR Nutrition incredibly helpful on all things feeding baby/ toddler - again not totally vegetarian but lots of veggie options. She has some books but I found plenty of ideas and recipes on her instagram and also blog - see here for example https://www.srnutrition.co.uk/category/recipes/ Not sure if she shares as many recipes on her insta any more but if you scroll back they're all there
Also a lot of our favourites were from the What Mummy Makes books - again not all veggie but lots of ideas - not sure how many recipes are available online but might be worth seeing if you can get second hand/ borrowing from library
Things I used to make lots of (still do quite a few of them -)
Eggy bread/ French toast - either as is, with cheese and spinach, or a sweeter version with smashed raspberries, vanilla extract and ground almonds
Different toast toppers - mashed avocado, easy home made hummus, different veggies made into dips/ paste by cooking and blending - can add herbs, garlic etc, cream cheese and raspberries, nut butters
Savoury muffins - our favourites (still) are from one of the What Mummy Makes books - smoky chickpea and cheese. I can't remember exact recipe off top of my head but basically mash a tin of chickpeas, grated courgette, grated cheese, eggs and flour, plus smoked paprika. They're really lovely - I'll see if I can find the proper recipe.
Creamy garlic mushrooms - wish my daughter would still eat these! We'd have them with rice or couscous. https://www.srnutrition.co.uk/2021/07/super-quick-creamy-mushrooms/
3 ingredient cheese scones - flour, greek yogurt and grated cheese - https://realfood.tesco.com/step-by-step/3-ingredient-savoury-cheese-scones.html
Creamy leek pasta - finely slice 2 leeks, soften them in butter/ garlic oil and meanwhile boil your pasta, splash in bits of the pasta water to help the leeks on their way, add in some garlic if you want extra, take the leeks of the heat once completely softened and add in cream/ creme fraiche, grated cheese and black pepper (could also be a tiny bit of mustard if you wanted) till all melted together. Combine with the pasta.
Lemon broccoli orzo/ whatever pasta
Dhal is another good one - I'm terrible at it for some reason and can never get it right despite knowing that it's objectively fairly easy! But DD always seems to quite like my attempts however they come out.
Bean stews
Lots of different soups - made them really thick and gave her bread to dip. She was always pretty good with a spoon too. If the soup wasn't quite thick enough I'd add couscous to her portion and let it cook in there/ thicken everything up.
Lentil cottage pie - I love this recipe and have always used it when I've made a veggie one, I would just adapt to use the very low salt stock etc - https://thehappyfoodie.co.uk/recipes/vegetable-and-lentil-cottage-pie/
Frittatas
Fritters - carrot/ courgette or sweetcorn ones. Usually with some kind of yoghurty type dip and some other veg on the side.
Veggie bake topped with breadcrumbs - kind of like this, again adapt salt content etc accordingly, I'd just use whatever I had - https://www.easycheesyvegetarian.com/creamy-vegetable-bake/
Homemade pizzas - we'd do the yogurt and flour base, or you can use pittas or tortillas and cut into strips. If I'm feeling organised I cook up a ton of tomato sauce with extra veg in it to use as a base and keep it in portions in the freezer (also to use for pasta etc).
Also porridge - we still eat piles of porridge and sometimes for lunch/ dinner - I do a 'carrot cake' version with grated carrot, courgette, apple, ground almonds, raisins, vanilla extract and cinnamon or mixed spice. Make leftovers into porridge muffins (just bake long and low in silicone muffin tray) and keep a stash in the freezer - DD still loves them now at 3.5