Can you put half baked brownies back in the oven after cut them?

No, you should not put half baked brownies back in the oven after cutting them.

When you cut into a brownie, you release the steam that has built up inside during baking. This steam helps to create the brownie's characteristic fudgy texture. If you put the brownies back in the oven after cutting them, the steam will escape and the brownies will lose their fudgy texture. The edges of the brownies will also become dry and crumbly.

Furthermore, cutting into the brownies exposes their moist interiors to the heat of the oven, causing them to cook quickly which may result in burnt or overcooked edges before the centre is finished.