The Best Peanut Butter Fudge

Ingredients

• 1/2 cup toffee chips
• 1 cup dark brown sugar
• 1/2 cup cream
• 1 cup granulated sugar
• 2 tbsp. corn syrup
• 1/2 tsp. coarse sea salt
• 1 tsp. pure vanilla extract
• 1 cup creamy peanut butter
• 1/4 tsp. cream of tartar