Keto Shepherds Pie

Name: Keto Shepherd's Pie
Ingredients: 1 medium head cauliflower, cut into florets (about 6 cups); 4 oz. cream cheese, softened; 0.25 c. heavy cream; 1.5 c. shredded cheddar, divided; 2 green onions, thinly sliced; 1 tbsp. extra-virgin olive oil; 1 small yellow onion, chopped; 1 medium carrot, peeled and chopped; 3 cloves garlic, minced; 1 tbsp. tomato paste; 1 lb. ground beef; 0.5 c. low-sodium beef broth