@Shaji P.A Welcome to Microsoft Q&A, thank you for posting your here!
If you have deleted the VM along with OS disk, then you would not be able to restore the deleted VM,
If you have only deleted VM without selecting the OS Disk, then you can restore the deleted VM. Please follow the below steps to Create a VM from a disk from Azure Portal.
- From the Azure portal, on the left menu, select All services.
- In the All services search box, enter disks and then select Disks to display the list of available disks.
- Select the disk which was previously associated to the deleted VM. The Disk page for that disk opens.
- In the Overview page, ensure that DISK STATE is listed as Unattached.
- In the menu at the top of the page, select Create VM.
- On the Basics page for the new VM, enter a Virtual machine name and either select an existing Resource group or create a new one.
- For Size, select Change size to access the Size page.
- Select a VM size row and then choose Select.
- On the Disks page, you may notice that the "OS Disk Type" cannot be changed. This preselected value is configured at the point of Snapshot or VHD creation and will carry over to the new VM. If you need to modify disk type take a new snapshot from an existing VM or disk.
- On the Networking page, you can either let the portal create all new resources or you can select an existing Virtual network and Network security group. The portal always creates a new network interface and public IP address for the new VM.
- On the Management page, make any changes to the monitoring options.
- On the Guest config page, add any extensions as needed.
- When you're done, select Review + create.
- If the VM configuration passes validation, select Create to start the deployment.
Hope this helps!
Kindly let us know if the above helps or you need further assistance on this issue.
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