Preheat your oven to 400°F and line a baking sheet with foil for easy cleanup. Peel your beets and cut them into 3/4-inch cubes—don't worry about perfect sizes since they're all gonna roast differently anyway. Toss the cubes with 1 tablespoon olive oil, salt, and pepper right on the baking sheet. Spread them out in a single layer so they actually caramelize instead of steam.
Pop the beets in the oven and roast for 35 to 40 minutes, stirring halfway through to catch those crispy edges. You'll know they're done when a fork slides through easily and the edges start turning darker. Mine always stick a little to the pan and that's totally fine—those crispy bits are the best part. Let them cool for about 5 minutes so you don't burn your fingers peeling them.
While the beets roast, whisk together your dressing in a small bowl. Combine the remaining 1 tablespoon olive oil, lemon juice, apple cider vinegar, honey, and Dijon mustard. Taste and adjust the seasonings—add more lemon if you like it tangier or more honey if it needs sweetness. This is where the roasted beet salad recipe really comes alive with flavor.
Toast your walnuts in a dry skillet over medium heat for about 3 minutes, stirring constantly so they don't burn. You'll hear them sizzle and smell that toasty aroma—that's when you know they're ready. This step takes 2 minutes and makes a huge difference in texture, so don't skip it. Pour them onto a plate to cool while you prep the rest.
Once the beets have cooled slightly, peel off the skin with your fingers or the back of a spoon (it slides right off when warm). Cut any larger pieces into smaller chunks so they're consistent size. Set them aside in a bowl and don't panic if your hands look stained—that washes off quick. The beets can sit here for a few minutes while you finish everything else.
Toss your mixed greens with about half the dressing in a large bowl, coating everything lightly. Add the cooled roasted beets, cooked quinoa, and most of the toasted walnuts, gently folding everything together. I personally think this tastes better when you don't overmix—you want distinct layers of flavor. Drizzle the remaining dressing over the top right before serving.
Divide between two plates and top with crumbled goat cheese, remaining walnuts, and fresh parsley. Serve immediately if you like warm beets, or chill in the fridge for 15 minutes for a cold version. Both ways are delicious depending on your mood and what season we're in. Honestly, the flavors meld even better if you let it sit for an hour.