The average 2 slice toaster uses 850 Watts of electricity to toast your toast.
Some larger 2 slice toasters may consume up to 900 Watts to 1,000 watts of electricity.
The toaster though is not on all the time though and is only on for a short period of time when you're toasting your toast in the electric toaster so you shouldn't see a big increase in your bill when using a toaster daily.
I use a 2 slice toaster twice per day everyday for breakfast and at most my bill increased by $2.00 extra per month when I started using the toaster.
So while they do consume a lot of electricity they only consume the large amount of electricity for a short time.