Melt butter and combine with flour.
Combine butter flour mixture, half & half and milk in crock pot.
Sitr in Velveeta, 1 package of broccoli, cauliflower and carrots.
Cook on low for six to seven hours.
Stir occasionally to combine if possible.
A few minutes before serving stir in additional bag of frozen broccoli carefully to retain florets.
Serve topped with shredded cheddar.