Make the Chocolate Topping: Combine the chocolate, 2 Tbsp peanut butter, 2 Tbsp coffee, and light corn syrup in a medium, microwave-safe bowl. Microwave for 30 seconds on high. Remove and stir. Continue to microwave at 15 second intervals on high, stirring in between, until fully melted. Stir in the coffee grounds and pour over the blondies. Smooth the surface of the chocolate with a spatula and sprinkle with a bit of coarse or flaked sea salt.