what’s wrong with my cookie??

I made a batch of cookies for my friend’s birthday party tomorrow, and decided to do a test first. I set the oven at 175c/350f, and kept the cookie there for 11 minutes. Unfortunately the cookie didn’t bake at all, it’s still gooey like cookie batter, and for some reason all the oil from the butter has separated. What did I do wrong?? is there still a way to salvage the rest of the batch? it’s all there waiting in the fridge.

I made this cake with buttercream frosting for my nephews bday, 1st time making a decorated cake like this. Not being served until tomorrow evening, temperature in my house is like 24°C. Do I store in fridge or at room temp?

Blueberry Muffins

Line muffin tin with papers, preheat oven to 400*F. 1 3/4 C. Flour, 3 tsp. Baking Powder, 1/2 tsp. Salt. Stir together in a large bowl. 1/4 C. Butter, 1/2 C. Sugar, 1Egg, 3/4 C. Milk, 1tsp. Vanilla. In another bowl, beat butter and sugar for 3 minutes. Beat in egg until quite smooth. Stir in milk and vanilla. Pour into dry ingredients. Stir only to moisten (batter will be lumpy) 1C. Blueberries, 1Tblsp. Flour. Stir lightly. Then carefully fold into batter. Divide batter into muffin papers. Bake 20-25 minutes until nicely browned.

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