back to share some of my own tactics..
Breakfast is different for each; 3yo will eat weetabix; shreddies and frozen blueberries. 7mo has fruit or veg slices and porridge fingers (I have porridge so I make his with mine).
Lunch I usually do sandwiches (3yo eats chicken; tuna; or almond butter and if squash them flat together and cut into finger strips 7mo can manage those too) or a 'dippy spread' of houmous and things to dip in it like carrot, pitta etc.. Is attempt to encourage 3yo to try new dippers. For 7mo I steam some of the dipping vegetables and either mash or let him eat on own. Also if houmous is quite thick he can shove it in his mouth by getting it onto his fist and sucking.
Also find sweet potato wedges good for the baby (shove in oven in morning and then take out with me in a tupperware) and hoping this will encourage 3yo to try them.
Home made pizza another option (3yo has tuna; 7mo has plain tom sauce without cheese as he's CMPI). Can whizz veg into the sauce if you have some handy.
Dinner: roast chicken with potato wedges and steamed veg sticks for baby to eat; Or chicken with couscous - chop tomatoes and cucumber to stir in cous cous plus any other veg I'm trying to sneak into 3yo. For 7mo I chop the cucumber into sticks; mix cous cous with a pouch to make spoon food. Pasta bolognese (7MO sucks sauce from pasta) or pasta with tuna sauce; pasta with avocados (whizz avos up in a blender with a bit of pasta cooking water and lemon juice; stir over pasta and add chopped cherry tomatoes for 3yo; plus bacon for grown ups or any kids who like it (mine doesn't)).
Stews work ok for hte 7mo as he can either try to eat bits of meat himself or I can chop/blend them for him. but sadly the 3yo is getting fussier about stew.
Also meatballs/burgers can work well for the baby and you can stir in grated/chopped veg before cooking but sadly again the 3yo is getting fussier about these things.