Cheesy Broccoli and Cauliflower Bake

Ingredients:
1 pound broccoli florets
1/2 pound cauliflower florets
1 tablespoon vegetable oil
1 small yellow onion, finely diced
3 cloves garlic, minced
12 ounces smoked sausage, polish or andouille, sliced into 1-inch rounds
8 ounces cream cheese, room temperature, cut into cubes for easier mixing
1/2 cup mayonnaise, or sub plain yogurt or sour cream
2 cups shredded Mexican blend cheese, divided
2 tablespoons Dijon mustard
salt and fresh ground black pepper, to taste
Directions:

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