Step 1

Preheat oven to 375 degrees. Butter a 9"x13" pan, and set aside.

Step 2

Melt butter in a pan. Add onions and saute until softened. Stir in garlic until fragrant about 30 seconds. Sprinkle flour over the top and whisk to coat. Cook flour mixture for about a minute while stirring.

Step 3

Slowly stir in chicken stock to prevent lumps and then milk. Bring to a simmer and cook until thickened about 3 minutes. Remove from heat and stir in 2 1/2 cups Grated Cheese.

Step 4

Place half of cut broccoli or broccoli/cauliflower mix into buttered pan. Cover with half of cheese sauce. Then repeat with remaining broccoli and cheese sauce. Sprinkle with remaining 1 cup of grated cheese.

Step 5

In a small bowl mix together panko bread crumbs with 2 tablespoons melted butter. Sprinkle panko crumbs evenly over the top of casserole.

Step 6

Bake for 25-30 minutes, until veggies are tender and top is lightly browned.

Step 7

Allow to cool for 5-10 minutes before serving.