Here are some photos of what this thing looks like

Bottom Edge

Top Edge

It's not our style at all and bring next to the cooktop, it's got greese and grime all over it.

I have no idea. Could it be attached with command strips maybe? Being glued to the wall seems strange.

No. It's super solid.

Oh okay. The reason I asked is because it looked loose at the bottom edge. I hope you figure it out or someone else on here knows something.

Yeah and that's the maddening part. it looks like it's just hanging but it doesn't move at all if you touch it. Logically it should probably hanging by a screw(s) and some metal wire because it is pretty solid and made of stone. It looks like it should be in an olive garden somewhere. I think it was installed by the original builder about 16 years ago.

I hate when stuff like that happens. It will probably be one of those things that is obvious once you figure it out. Lol. Grease and grime can be sticky so that could be part of why it won't move at all.

Looks like construction adhesive/caulk from the top. I would try to get dental floss behind it and see if you can cut it off that way.

Can you poke at the white stuff with a long screwdriver or something and see if it chips it. Could it be tile mortar?

Go ahead and destroy the field tile its glued to. And keep going. Rip it all of, including the drywall. And then put up new, and a new backsplash that isn’t a $1 floor tile.

Mortar, thinset, and construction adhesive all seem like possibilities. You need to be prepared that you could damage the tiles behind, or that you can't get all the gunk off of it. Weigh whether living with Tuscan kitchen kitsch is worse than the possible alternatives..

Have you tried lifting it straight up? It could be hung on a French cleat.

My guess is that it's secured with a strong adhesive, or that the plaque was mounted with screws that are now hidden under the tile. You may need to destroy it to get rid of it, in which case you should be prepared to replace it with something new that is more to your taste as there could be permanent damage -- such as holes through the tile on the wall -- or as a result of your demo.

If it's made of stone, can you carefully take a small hammer to the edges? Maybe break it up enough to see how it's attached? Maybe it's only glued/mortared around the edges and you can break up the center.

Clean it well and paint it to coordinate with the rest of the tile, then either use it as a frame to hang something else in it, like a vintage cooking utensil, or, if you’re artistic, paint a new design on it. You won’t get it off without destroying the tile its adhered to, so if you’re not replacing that right now, leave it.

Yeah. That’s gotta go. Hmm. I would pull the range out, cover the adjacent countertop with plastic, cover the floor with a fat, folded canvas drop cloth, put some acetone in a spray bottle, saturate behind the top edge and let it run back in there, then go at it with gloves and a Cable saw. Rinse, repeat. Acetone may not help — but if there is any adhesive back behind it, it might soften it a little. If your floors are hardwood, put a plastic drop-cloth under the fabric one first. It is a crazy long shot, but might work a bit better than a hammer. Worse case scenario, you can go back with a stainless backsplash panel to hide any damage to the original tile.