Ugh, your bomb recipe has fake sugar sweetener! I can do you one better.
Buy very very dark chocolate. I live off 92% madecasse bars. Maybe you can’t handle them as your treat (they are mine, but not one adult I’ve shared with has ever liked them; most people are too used to sweet tastes), but they would be perfect melted for your chocolate outside for your fat bomb. (Madecasse is the best, but 90% lindt bars are easier to find)
Then just use your unsweetened peanut butter as your interior. It’s yummy. If you need more sweet taste, simply use jif or any regular, somewhat sweet, peanut butter. Those are still much less sweet than the “candy” peanut butter used inside a Reese’s.
No fake sweeteners, yuck.
My husband is actually making that recipe using Monk Fruit Extract, because he doesn’t like using fake sweeteners either. I like them - they are not anything like regular ‘peanut butter cups’, but a pleasant treat on a low-carb diet.
I’ll tell him about your dark chocolate.