Unlit shader with shadows support for Unity's Built-in Render Pipeline

UnlitWithShadows.shader

Shader "Unlit/Texture with Shadows"
{
	Properties
	{
		_Color ("Color", Color) = (1,1,1,1)
		_MainTex ("Texture", 2D) = "white"
	}
	SubShader
	{
		Tags { "RenderType"="Opaque" "Queue"="Geometry" }
		LOD 100

		Pass
		{
			Tags { "LightMode" = "ForwardBase" }
			
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#pragma multi_compile_fog
			#pragma multi_compile_fwdbase
			
			#include "UnityCG.cginc"
			#include "AutoLight.cginc"
			
			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float4 vertex : SV_POSITION;
				float2 uv : TEXCOORD0;
				UNITY_FOG_COORDS(1)
				SHADOW_COORDS(2)
			};

			fixed4 _Color;
			sampler2D _MainTex;
			float4 _MainTex_ST;
			
			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
				UNITY_TRANSFER_FOG(o, o.vertex);
				TRANSFER_SHADOW(o)
				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				fixed4 col = tex2D(_MainTex, i.uv) * _Color * SHADOW_ATTENUATION(i);
				UNITY_APPLY_FOG(i.fogCoord, col);
				return col;
			}
			ENDCG
		}
		
		UsePass "Legacy Shaders/VertexLit/SHADOWCASTER"
	}
}

How To

Simply create a new Unlit Shader and replace its contents with this shader. Then, assign Unlit/Texture with Shadows shader to your materials.