In a medium bowl, whisk the olive oil, balsamic vinegar, brown sugar, soy sauce, garlic, Italian seasoning, dijon mustard, red pepper flakes, and a pinch of salt and pepper together.
½ cup olive oil, 3 tablespoons balsamic vinegar, 2 tablespoons brown sugar, 2 tablespoons low-sodium soy sauce, 2 cloves garlic, 1 tablespoon Italian seasoning, 1 teaspoon Dijon mustard, ⅛ teaspoon crushed red pepper flakes, Kosher salt and freshly ground black pepper