Chopped onion versus dried minced onion
Yes, you can. Here are the ratios of fresh to dry:


Fresh : dried = 4 : 1
1 cup : 1/4cup
1/4 cup : 1 tbsp
1 tbsp : 3/4 tsp
1 tsp : 1/4 tsp


I would suggest you put the dry in some water for a few minutes to rehydrate (similar to the proper usage of dried minced garlic).