Soften the fats: Let the butter sit at room temperature for 10–15 minutes. If your coconut oil is solid, gently melt it until just liquid.
Combine the base: In a mixing bowl, add peanut butter, softened butter, and coconut oil.
Beat with a hand mixer or whisk until smooth and creamy.
Sweeten and flavor: Add powdered sweetener, vanilla, and salt. Mix again until fully blended. Taste and adjust sweetness.
Customize (optional): For chocolate peanut butter bombs, whisk in cocoa powder.
Fold in sugar-free chocolate chips or chopped peanuts if you like.
Portion it out: Spoon the mixture into a silicone mini muffin mold or silicone candy mold. Aim for about 1 tablespoon per cavity.
Chill to set: Freeze for 20–30 minutes or refrigerate for 1–2 hours until firm.
Pop and store: Remove from molds and transfer to an airtight container. Keep chilled.