For vegetarians soak and type of white bean - butter beans, haricot etc and put in to cook with suitable sauce. There are vegetarian slow cook books on Amazon
Vegetarian Slow Cooker Recipe Book:
30 Easy Set It & Forget It Meals
by Maria Holmes | 18 Dec 2013
3.83.8 out of 5 stars (64)
Paperback
Price, product page£4.85
Slow Cooker Vegetarian: Healthy and wholesome, comforting and convenient
by Katy Holder | 1 Nov 2018
4.44.4 out of 5 stars (166)
Paperback
Price, product page£17.99
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As you see some can be bought second hand.