How do you usually eat potatoes?
Mashed - use mashed cauliflower, rice, mashed carrots and parsnips
Roasted - Yams, sweet potatoes, squash.
Fried - Yams, sweet potatoes
Or you can just eliminate spuds and substitutes from your diet.
You can top Shepherds Pie with other mashed veg or lentils.
Be careful of peppers, they are in many spice blends. Thai food, Indian Food, Mediterranean food, Mexican Food, BBQ, Hungarian Goulash etc.