Spaetzle with Bratwurst, Sweet Potatoes and Caramelized Onions - Yummy Gusto

Ingredients

• 2 tablespoons unsalted butter
• 1 sweet yellow onion, thinly sliced
• Pinch of granulated sugar
• 1 medium sweet potato, cut into 2.5 cm cubes
• 1 tablespoon extra-virgin olive oil
• Salt, to taste
• Freshly ground black pepper, to taste
• 340 g bratwurst links (approximately 3–4 links, size dependent)
• 5 cups cooked spaetzle (homemade or store-bought)
• 180 g grated Havarti cheese
• 180 g grated Gruyère cheese
• Fresh sage, finely chopped, for garnish