How to record interest earned on bank account into QB?

You can use the bank deposit feature to record the interest that you received, @maxc01. 

First, create an interest earned account from your Chart of Accounts:

1. Go to your Accounting menu, then New to create a new interest account.
2. Under the Account Type column, select Other Income. 
3. For the Detail Type column, select Interest Earned. 
4. Enter the desired name, then click Save and Close.

You can now record the interest earned to the bank: 

1. Click the + New button and select Bank deposit. 
2. Under Add funds to this deposit, enter the interest earned account you've created, then add the amount.
3. Click Save and close.

Here’s more information on how to record and make bank Deposits in QuickBooks Online.

Let me know if there is anything I can help you with your transactions, by leaving a comment below.​ Take care and have a wonderful day!