Note for making sweeter fudge: You can use a sweetened yogurt, but be sure the yogurt is still veryyyy thick for the best results! (It's still super yummy and sweet with unsweetened yogurt, though!).
In a large bowl, add the yogurt and peanut butter, mixing well until it's combined. Let it sit at room temperature for a few minutes until it's almost room temp. If the yogurt you're using isn't flavored, you can stir in a teaspoon of vanilla so that your fudge has some flavor. You can also add add 1-2 tbsp of maple syrup to your yogurt, mixing it in well for a sweeter fudge.
Line a small loaf pan or glass tupperware container with parchment paper and set aside.
NOTE: You'll want to work quickly once the chocolate is melted, as if you let it cool too much it can seize when mixed into the yogurt creating chunks.
Either using the double boiler method or microwave, melt the chocolate. Microwave – In a medium bowl, add the chocolate. Heat in 30 second increments, stirring well between each, until completely smooth.
Once the chocolate is smooth, pour it over the yogurt. Using a spatula, mix the two together well until uniform. Then pour it into the prepared pan. You can press chopped peanuts and flakey sea salt into the top. Then, place the pan in the freezer for a few hours until it has firmed up.
Once firm, cut into pieces. Store the fudge pieces in an air-tight container or freezer bag in the freezer for up to 2 months! This recipe is formulated to be kept in the freezer and they may become too soft if kept in the fridge!