Roasted Acorn Squash with Garlic Butter and Burrata

Name: Roasted Acorn Squash with Garlic Butter and Burrata
Ingredients: 4 tablespoons unsalted butter, melted; 1 tablespoon minced shallot; 1 garlic clove, minced; 1/2 teaspoon thyme leaves; Kosher salt; Pepper; Two 1 1/2-pound acorn squash, halved lengthwise, seeds discarded; 2 tablespoons extra-virgin olive oil; 1 tablespoon aged balsamic vinegar; 4 cups baby greens (2 ounces); 1/4 small red onion, thinly sliced and rinsed under cold water; One 1/2-pound ball of burrata; Cracked black pepper, for garnish; Flaky sea salt, for garnish