Sorry to hear Maisie and Poppy have gotten into some mischief this morning; one pitfall of owning a Golden Retriever is that they can be real vacuum cleaners when it comes to food!
Luckily, they have not eaten a large amount (even if the smaller one ate the whole portion, this would equate to less than 3mg of onion per kg and the lowest reported toxic dose is 15g/kg.
When it comes to onion, it tends to pose more of an issue when fed in small amounts over time as it can build up in the system.
In your guys case, they should be absolutely fine.
However, Bolognese is quite rich (!) so an upset stomach would not be unexpected. I would advise a bland diet of boiled white chicken and rice (no treats or dog food) for the next 24 hours to ensure their stomach is settled. Monitor for any signs such as vomiting or diarrhoea.
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