hmm, I'm not sure whether calorie counting is the best way to go for a cutting diet. You should be paying more attention to what those calories are made up of i.e. your carb/protein/fat ratios. You should probably also be having more than 1800 cals in a day if you're doing a lot of cardio. But if you want some >300 cal meal ideas then what the hell

...
* 4 egg white omelette with any of the following: tomatoes, onions, mushrooms, lean-cut ham, peppers, spinich, tofu ... (an egg white is only 16 cals)
* 2 quorn fillets with 200g quark/cottage cheese (approx. 240 cals, depending on the brands)
* 300g of rutabaga/swede with tofu or quorn (100g of swede is only 11 cals)
* 130g tin of low-sugar baked beans with wholewheat toast (approx. 225 cals)
* stir-fried vegetables with a source of protein added (e.g chicken breast, tofu, quorn, tuna, turkey) (around 200 cals for a regular portion)
* small tuna/salmon steak with green vegetables (e.g. broccoli or spinich) .... around 300 cals, but depends on serving size
... However, as I mentioned, you really do need to also consider how much fat, carbs, and protein you are getting if you want to make the most of cutting. If you don't get enough protein, for example, then your body will start consuming muscle over fat.