01 -
Line a 9-inch square pan with parchment paper, leaving overhang on two sides. Lightly smooth the paper into the corners.
02 -
Place the flour in a microwave-safe bowl. Microwave for 1 minute, stir, then microwave for 15-30 seconds more until it reaches 165°F. Let it cool completely.
03 -
Beat the softened butter, granulated sugar, vanilla, and salt until smooth. Add the cooled flour and beat until thick and evenly mixed.
04 -
Combine the sweetened condensed milk and white chocolate in a microwave-safe bowl. Heat in 15-second bursts, stirring after each, until smooth and glossy.
05 -
Beat the melted chocolate mixture into the butter base. Fold in the dry blueberries gently, then add small dabs of gel color and stir only once or twice for a marbled look.
06 -
Spread the fudge into the prepared pan and smooth the top. Refrigerate for at least 6 hours, or overnight, until firm enough to slice.
07 -
Heat the oven to 400°F. Stir oats, brown sugar, vanilla, honey, and a pinch of salt together. Spread on a parchment-lined sheet and bake for 7-10 minutes, stirring once, until lightly golden. Cool completely.
08 -
Lift the fudge from the pan, sprinkle with the cooled oat topping, and cut into small squares with a sharp knife. Keep chilled until serving.