2 chicken breasts, assuming your cooking method doesn't add any calories - ~450 calories
5 eggs - 350 calories
1 cheese stick - ~60 calories
1 serving of peanuts - ~170 calories
2 servings of peanut butter - ~400 calories
4 slices of bread - ~480 calories
You're still eating close to 2k calories, maybe more or less depending on products, condiments(chicken straight up is boring), portioning, etc. You should still be losing weight, but it looks like your estimations are off by 50%, so I would get a kitchen scale and start tracking things.
Just wanted to add that its REALLY easy to go overboard with peanuts. What you think a serving of peanut butter is probably closer to 2.