Wash and dry produce.

Halve, peel, and thinly slice shallot. Halve, core, and thinly slice apple. Roughly chop walnuts.

In a medium microwave-safe bowl, combine shallot, vinegar, ½ tsp sugar, ½ tsp salt, and pepper (1 tsp sugar and 1 tsp salt for 4 servings). Cover with plastic wrap and microwave until shallot is softened, 30-50 seconds. Set aside until ready to use in next step.

Melt ½ TBSP butter (1 TBSP for 4 servings) in a large pan over medium heat. Add ¼ tsp thyme (½ tsp for 4) and cook, stirring constantly, until fragrant, 30 seconds. (Save remaining thyme for another use.)

Add apple, ¼ tsp sugar (½ tsp for 4), and a pinch of salt; cook, stirring occasionally, until lightly browned and tender, 2-3 minutes.

Turn off heat. Let apple cool slightly, then transfer to bowl with pickled shallot. Toss to combine. Wipe out pan.

Melt 1 TBSP butter (2 TBSP for 4 servings) in same pan over medium-high heat. Add panko and walnuts; cook, stirring, until panko is golden brown, 3-5 minutes. TIP: Keep an eye on the panko—it browns quickly!

Transfer to a small bowl. Season with salt and pepper.

In a large bowl, toss together arugula, mixed greens, blue cheese dressing, half the apple and pickled shallot (draining first), half the walnut panko, and half the feta.

Taste and season with salt and pepper.

Divide salad between shallow bowls. Top with remaining apple and pickled shallot, remaining walnut panko, and remaining feta. Serve.