I think it is fine to recook to the same temp. Don't know what the additional fat
will do to the texture.
Here's a terrific one that is dead easy. People practically slug it out for this:
1 bag milk chocolate chips
1 bag peanut butter chips
small can salted cocktail peanuts
1 stick of butter
1 can Eagle brand milk
Chop peanuts.
Melt peanut butter chips with half of butter & half of milk in microwave, being careful not to burn. Stir smooth, stir in chopped peanuts. This will get to be almost dough-like very fast. Press in greased pan.
Melt chocolate chips with remaining butter and milk. Spread on top of peanut layer. Let set, then cut in squares.
My ex-sister-in-law used to make this and I can't count how many people I heard ask if Genie would bring her fudge.