Balsamic Feta Brussels Sprouts

WHAT YOU'LL NEED

• 1 Knorr® Vegetable Bouillon Cube, crumbled
• 2/3 cup (150 mL) water
• 2 Tbsp. (30 mL) oil
• 1 1/2 lbs. (675 g) Brussels sprouts, trimmed
• 1/2 large red onion, sliced 1/4-inch (6 mm) thick
• 2 Tbsp. (30 mL) balsamic vinegar
• 2 Tbsp. (30 mL) crumbled feta cheese