The methods to increase the viscosity and hardness of homemade yogurt are as follows:

1. After adding milk powder and heating, scoop out part of it, add two tablespoons of milk powder and stir until it is fully dissolved, then pour it back and stir it evenly, so that the yogurt made will be sticky.

2. The higher the solid content of whole milk, the higher the consistency of yogurt, so you can use whole milk with high fat content as yogurt, or add whipped cream, so the hardness of yogurt is relatively high.

3. Thickener Adding gelatin, seaweed gum, etc. in making yogurt can effectively increase the viscosity and hardness of yogurt.